In the 1950's they used their dies past normal retirement. Thus all kinds of chips, cracks, BIE's, extreme
Die Deterioration has been noted. These are just normal errors. That is why you found 5 in your roll. It you counted the die pairs by markers, you could tell how many dies were used in that run that made your coins. I've found as little as 4 die pairs in a roll and 17 die pairs in the zincolns in a run/bin.
Varieties happen from coin #1 till it is retired. On your coins the die is aging and now getting close to the LDS/VLDS die states. But they were normal dies when they started. Hope this helps.