theres some reasons why anemone moves ard.
1) they dun like the current (small to mild medium current prefered)
2) searching for lights (strong lighting needed)
3) searching for more oxygen. (do something about it. skimmer too weak? or temperature too high, dissolved oxygen reduced. add a fan or a chiller if u dun have it. if u have a chiller already and a good skimmer, then oxygen its not a problem already.)
do more readings and research. Strong Lighting is surely needed.
these are my experiences in keeping anemone.
hope it helps u atleast abit.
good luck.