Without a picture, I'd have to guess that you don't know what you don't know. Either you've set it up in some strange way that you didn't tell us, or you're misinterpreting what equally spaced shadows really look like when perspective and angles come into play.

I set up a gel on an infinite light here, with a repeating leaf mask. No matter where I place my pawns, they seem to be covered by five leaves, and exactly the same number are missing from the curved background prop. I see no evidence that the repeats are in any way changing from one object to another.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)