Interestingly enough mine have yet to move... but i know its not happy.
You're not missing much. Just a few prolonged heart attacks or a couple hours worth of panic when you have to go to work and dont have anyone to give you updates on what the anemone is doing.
Even having years of experience with this particular anemone, I was not happy it was trying to wander.
Smaller more regular feedings is better long term than less frequent heavy feedings. Once it get's healthy enough, the clowns will not be able to pull food from it, and it will "steal" food from them as they bring it back to the anemone in an attempt to eat in peace without competing with the other fish in the tank.