Problem with some frames

Hi everyone.

When I am finishing the color grading (XML export from FCPX to DVR) and ready to playback, export back to FCPX or even export as a movie, I notice that some frames appear like they are ignoring the color grading corrections and appear as flat.

I can show this on a YT link, but I understand I am not allowed to post it here?

Could someone help?

Thanks,
Antonis

I have a youtube video that shows the issue but i cannot post it here.