At this stage my guess is that this is an issue with the footage - that the file metadata is somehow corrupted or incorrect in someway. It might be worth a final try importing them into something else. Have you tried them in Premiere Pro? But I don't hold much hope of success TBH. As A.I.1 suggests, Handbrake might also be worth a try as a conversion utility : handbrake.fr You might also want to download and try MediaInfo While this software won't solve the issue, it is a useful tool to examine media / video files, so at least you could see if the file itself reports the correct frame size or not.
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