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It's caused by the horizontal AFC being too slow. VCRs put out a signal that has a pretty large amount of instability in the timing of its sync compared to a boradcast signal. Modern TVs have a faster reacting horizontal AFC that allowes it to track these changes in the sync signal. It's possible to change a few complonent values to greatly improve this in older TVs. I did it on a 60's Zenith I use with a VCR. Your other option would be to buy a time base corrector, or a VCR with a built in time base corrector (such as a Panasonic AG-1970 or AG-1980).
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