Colored frames when adjusting brightness/contrast

Hello kind people. I am trying to adjust brightness/contrast on a short clip in my video, and I keep getting some colored frames that play when I replay the clip. I can stop at the colored clips, some are blue, and some are magenta. Anyone have an answer? I have rendered the clips, but I can't figure it out, and have never had this problem.
Thanks,
Mike.
Final Cut Pro 6.0.6

I reset the codec to Pro. All the footage I shot myself with the same camera setting. Also, I am only editing this one short clip, so it's not mixing with anything else I don't think.
I figured out a go around from my problem. Instead of going to Effects, Video Filters, Quicktime, Brightness/Contrast, I am now doing Effects, Video Filters, Image Control, Brightness. It seems to automatically take care of the contrast to make it look nice.

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Colored frames when adjusting brightness/contrast

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