Hi Welcome to JustAnswer
I will look into it and let you know as soon as possible.
This could be some kind of rendering issue. Please change the Video Processing settings for the sequence from "Render all YUV material in high-precision YUV" to "Render in 8-bit YUV".
Also try exporting it to some other format and see if you are getting the glitch.
Do you have Perian installed? It would be one of your System Preference icons.
Did you change quality of those images ?
Please try to export it to some other format and see if it working. Try and use some other player to view it. Did you see the same thing during preview of it.
yes in this case the problem is in the image setting only.
Can you try removing all the effects from those particular images and see if you are still facing the issue.
Did this worked ?