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marrowsAre they new bindings?
In which direction do they have play? side to side or back and forward
I've encountered this problem in many many older pairs of griffons. Usually it happens in the toe piece, but I've seen it in the heel as well.
Could be from a small crack in the rail, but most commonly it is just general wearing of interlocking parts which leads a little bit of movement.
If they are new, and mounted correctly, you shouldn't be getting any movement at all. Return them if so.