I don't know if this is an answer to why some card years will slide around more than others, but there are certain years from Topps that the card stock is thicker than other years. A good case in point is the 1977 issue which is considerably thinner stock than the 1976 issue.
For a newer year, the 1977's are hard to find without chipping too, and IMO a sleeper set due to those factors.
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My new found obsession the t206!
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