Random JPGs Being Created

I just downloaded CO last week and trying to get the swing of it. But one thing that is vexing me is for some reason I'm getting JPGs created during my import. I'm only shooting RAW, not RAW+F, so I'm not sure why this is happening. Some imports have a 1:1 RAW:JPG, but sometimes it's just some of them.

Any ideas what setting(s) I need to correct?

Thank you.