Anemone has gone behind the rocks

I just got this RBTA anemone 5 days ago and it keeps moving around. It is about 6 inches in diameter and now its behind all the rocks and is about 3 cm thick.

There is no light and barely any flow behind that rocks. Should I try to move all the rocks to get him out? Will it come out or can it die back there?

Why would it be doing this?
 
I had mine for 2 weeks. He went behind the rocks on day 2. He started coming out yesterday. I looked at the spot where he was and he had split!
 
Had mine since last saturday it went straight behind the rocks. Today I left the tank lights off and living room lights on and when i got home its out in the front.
 
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