Repeat with applying metadata sometimes doesn't apply

I have a strange issue with applying metadata after a batch rename, and unfortunately I only have hearsay evidence of it actually occurring and can't reproduce it myself. Our script (attached below):

The photographers have occasionally run into an issue where they will run the script, paste in the sku and the metadata won't be applied to all of the selected variants. Doesn't happen all the time and if they run the script again they usually have success. I have tested and tested and tested this script and have yet to reproduce the error yet they seem to have it occur over multiple users on different computers. Is anyone able to see anything inherently wrong with the code? Or is there maybe a setting within Capture One we should make sure is checked or unchecked?

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	--Determine shoot name data and Dialog to Enter BSC
	------------------------------------------------------------------------------------------------
	
	set progress total steps to 6
	set progress completed steps to 0
	set progress description to "Updating Metadata..."
	set progress additional description to "Preparing to process."
	
	
	tell application "Capture One 10"
		activate
		set sessionName to name of current document
	end tell
	
	set progress additional description to "Updating..."
	set progress completed steps to 1
	--set shootName to trimText(sessionName, ".cosessiondb", "end")
	set {shootName, dbName} to my theSplit(sessionName, ".")
	set {shootDate, modelname, timeOfDay, baynumber, photographerName, businessunit} to my theSplit(shootName, space)
	
	
	--determine studio location
	if sessionName contains "Accessories" then
		set studioLocation to "_off_"
	else
		set studioLocation to "_on_"
	end if
	

	set progress additional description to "Updating..."
	set progress completed steps to 2
	set shootDateShort to do shell script "date +'%Y%m%d'"
	
	tell application "Capture One 10"
		activate
		set bscCorrect to "false"
		repeat while bscCorrect = "false"
			
			set currentBSC to {text returned} of (display dialog "" default answer "" with title "Enter BSC") as text
			
			set characterCount to length of currentBSC
			
			
			if characterCount is greater than or equal to 15 then
				set currentBSC to (characters 1 thru 15 of currentBSC) as text
				set bscCorrect to "true"
			else
				display dialog "The BSC you entered is too short.  Try again."
				set bscCorrect to "false"
			end if
		end repeat
		
	end tell
	

	set progress additional description to "Updating..."
	set progress completed steps to 3
	------------------------------------------------------------------------------------------------
	--Check for BSC previously used
	------------------------------------------------------------------------------------------------
	--Configf file to write values to
	set shootList to "/Volumes/WORKING/In_Progress/" & shootName & "/shootList.plist"
	
	
	tell application "System Events"
		--try
		tell property list file shootList
			if property list item currentBSC exists then
				set BSCexists to button returned of (display dialog "This BSC has been used previously.  Would you like to continue or stop?" buttons {"Continue", "Stop"})
				if BSCexists = "Stop" then
					error number -128
				end if
			else
				make new property list item at end with properties {kind:string, name:currentBSC, value:currentBSC}
			end if
		end tell
		--end try
	end tell
	
	
	
	set progress additional description to "Updating..."
	set progress completed steps to 4
	------------------------------------------------------------------------------------------------
	--Set Batch Renaming Settings and run "Batch Rename" command
	------------------------------------------------------------------------------------------------
	tell application "Capture One 10"
		--input BSC into Batch Rename window
		tell batch rename settings of current document
			set method to text and tokens
			set job name to currentBSC & "_" & shootDateShort & studioLocation
			set token format to "/Job Name/2 Digit Counter/"
		end tell
		
		set theVariants to selected variants
		tell current document
			batch rename variants theVariants
		end tell
	end tell
	
	delay 0.2
	
	set progress additional description to "Updating..."
	set progress completed steps to 5
	------------------------------------------------------------------------------------------------
	--Apply metadata to specified fields
	------------------------------------------------------------------------------------------------
	tell application "Capture One 10"
		set selectedVariants to (get selected variants)
		tell current document
			if selectedVariants is {} then
				display notification "No images selected -  select one or more images"
			else
				repeat with |counter| from 1 to count of selectedVariants
					set thisVariant to item |counter| of selectedVariants
					set oldStource to get status source of thisVariant
					
					set contact creator of thisVariant to shootName
					set contact creator job title of thisVariant to shootDate
					set contact address of thisVariant to modelname
					set contact city of thisVariant to timeOfDay
					set contact state of thisVariant to baynumber
					set contact postal code of thisVariant to photographerName
					set contact country of thisVariant to businessunit
					
				end repeat
			end if
		end tell
	end tell
	
	
	set progress additional description to "Updating..."
	set progress completed steps to 6
	
	-- Reset the progress information
	set progress total steps to 0
	set progress completed steps to 0
	set progress description to ""
	set progress additional description to ""
	


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--Array split
------------------------------------------------------------------------------------------------

on theSplit(theString, theDelimiter)
	-- save delimiters to restore old settings
	set oldDelimiters to AppleScript's text item delimiters
	-- set delimiters to delimiter to be used
	set AppleScript's text item delimiters to theDelimiter
	-- create the array
	set theArray to every text item of theString
	-- restore the old setting
	set AppleScript's text item delimiters to oldDelimiters
	-- return the result
	return theArray
end theSplit

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