cropped screenshots showing the problem are pretty useless as a diagnostic tool. What you need to do is show us your entire comp with the modified properties of the layers giving you problems revealed. Just press the U key twice in AE. This will show us everything you have modified. Then do a print screen and just paste to this forum. It could not be easier.
If you are applying the keying effect in Premiere then send a screenshot from Premiere to the Premiere Pro forum.
As long as your AE is up to date, your Premiere Pro is up to date and you have purged all cache files things should work just fine unless you have thrown a switch that will be obvious when you reveal the modified properties of a layer.
Is your footage is a single movie or sequential images? What effect do you use for keying?
What Rick said - show us the full shot and your effect settings, not some fragment zoomed in to infinity. So far none of what you have offered is in any form useful to help you track down the issue.
Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.