Without seeing the Pinan Shodan in question it's hard to know what you saw, but the folliwing might help.
Itosu's original Pinan Shodan when Transplanted to Japan and was Renamed/reworked became Heian NiDan.
Apparently Funakoshi felt the orignal 2nd form was simpler and put it first.
In time I recall reading some other groups felt the same and renamed/reordered Pinan NiDan to Pinan ShoDan, etc.
So perhaps you were seeing one of the groups that switched the first two Pinan kata. Everyone did not do this.
Then again perhaps somebody created new forms and lifted the names. In the contemporary MA scene any answer might be possible anywhere.
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