Exporting Images again after Change in PS but Export looks like before!

I have a bit of a strange behaviour when exporting pictures more than once.

I exportet a Pictrure (TIFF) which was edited in Photoshop and afterwards got some adjustments in C1.

Now the client wants some changes to the picture. So I open it in PS change something (wrinkles for example) -> Save it

Now in C1 it shows the changes from PS and my C1 adjustments to the tif are visible. Now when i export it again to the same Folder as before, it adds a 1 to the filename (which is better than overwriting it) BUT the image looks exacly like before without any changes.

Now I got suspicious and tried some major adjustments in C1 to make it look completely different. Export it again gets a 2 at the ending but still looks like the first one but with different adjustments. Created a new Version (Copy) exportet that one. Still looks the same as the First one. Now i changed the export directory by changing Subfolder Name and tada. Now it is correct. So it looks like it takes the old tiff file from somewhere or maybe out of the cache and exports with a old version of it instead of the Version that is correctly shown in C1.

Is ANYONE able to recreate that Problem and maybe has a solution for it?

I first suspected OneDrive, where I normally export directly to a Folder that is synced. But the error can also be reproduced in the output folder showing the same behaviour.