Wonky transition from one slide to another

During the preview, I noticed that there's a wonky transition from one of the slides to the next one. It blinks. I cannot figure out what the problem is because there doesn't seem to be a problem with the screen cast when I view it in edit mode.

I've tried going back to the original video and redoing the edits. I deleted the slide and put in a new one. Nothing seems to work.

I'll admit I'm stumped.

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