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Signers do that sometimes. I know there is a Killebrew collector on this forum who owns a paper signed multiple times by Harmon. Sometimes it is to make sure the pens are good, in Teds case I saw him when he was pretty old and he could barely see stuff. They would put it in front of him and place the pen where he should start. He may have truly been practicing so he didn't give the first guy a crappy signature. When players get old their autographs can really go down hill. Hank Aaron is an example. I'm not sure I would let him sign something I own now.

I never trusted John Henry, but there is legit reasons for practicing an autograph.