Replying to Look p10 heelpiece slop

I've got a pair of Look P10 bindings mounted up on some jib skis.

I noticed that the heelpiece on them has some lateral play. You can rock it back and forth from one side of the ski to the other a little.

I thought it was strange until I noticed my Rossi Axial 110's do the same thing. I don't remember this ever being the case with other bindings, but then these two sets are the only ones I've ever owned with a pivoting heelpiece.

Is this wiggle room normal?