@wjbender - Im completelly shure that this problem doesnt come there, i've tested it myself, thanks for the help anyways, every opinion is apreciatted here

@Malice - It's a good ideia, but in that array, each entity had its own clone, so even if the clone and the original have the same pointer, it wouldn't make sense for the skin to still be shared by ALL the entities with the same model, specially after i did that ent_clone.

-------------------- EDIT --------------------

I had to make a few changes to the code you wrote, because if i do this
bmp_tmp = ent_getskin(ast_i)
the function that colours the bitmaps will fail, because i think
bmap_lock(bmap, 0);
will return an error or something
but it dind't work anyways, i'll keep on trying till it works