I noticed the exact same behaviour with the Audio Track Field. I you deselect a prior selected audio track type and select new one(s), the old one is still selected when you leave the popup.
That is indeed the same type of field. It happens on all of the fields that share this type, and the fix will also immediately work on all those fields when we get to it. Thanks for reporting!
If you deselect the set ratio/audio/etc. BEFORE you edit that field (X it out), then enter your desired setting and save, that process deletes the original.