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Griffons and Jesters (using that toe pylon design, I think they've changed it in the latest ones) all do this eventually. Basically it's a square peg in a square hole, and over time both the peg and the hole get slightly worn and this creates room for it to pivot.
At first they'll just go "click" from time to time as your boot bounces up and down in the toepiece.
Eventually they'll get worse and worse until, if you take a massive hit on the tails, they'll fold forward enough that your toe pops out vertically. At this point they rapidly get worse.
I've had 2 pairs warrantied for doing this (until I went to FKS and never looked back) - talk nicely to your shop and they should sort you out.