a strange problem with prone animation

hi all,
so I have crouch anims, swim anims and prone anims,
the swim and crouch work fine, but when I call the prone anim, the model prones, but rotates 90 degrees counter clock wise.
if I replace the prone anim with the crouch or swim anim, which work perfectly, when I call prone, they rotate 90 degrees counter clockwise.
why?
the crouch and swim work fine, but using prone rotates the model 90 degrees,
also, even though I moved bip01 down to ground level, in prone, bip is at the same height as standing.
thanks