All of a sudden my clowns decided they don't like corals close to their anemone.

A couple days ago my Mike Accardi blue stag was "rolled" off the rocks, over/thru the anemone and was laying on the sand. I couldn't figure out how it fell. It's mounted to a nice size piece of rubble (about 6"x2"). Came home from work yesterday and here we go again. Laying on the sand...and not looking too good. A couple tips are broken off and there are a few spots where it was stung by the anemone.
So I come home from work today. The blue stag is OK (I rearranged some rock so it can't move), but my big tan acro colony is teetering over the anemone, a piece about 3" is broken off a tip, my tricolored validia is buried under the acro colony and a tan acro frag was rolled off the rocks, thru the anemone and laying in the sand. I just moved some rock to stabilize the colony and put the valadia back where is was. As I am sitting here, the evil clowns are still trying to move that colony.
Damage so far: blue stag-tips broken and some bleaching from anemone sting. Tan acro colony-3" frag broken off and clowns still trying to move it. Tricolor valadia-looks OK so far, just no polyp extension yet. Tan frag-no polyp extension and looks like it may have gotten stung pretty good.
I have no idea why all of a sudden the clowns are moving stuff. Both are doing it too...and the female is huge and can move a pretty nice sized rock.