I agreed to this opinion more.
I think it's is trying to re-adjust to your environment but you said nothing has changed in the environment and all pars seem OK, so I don't want to jump to the conculsion and you guys think I am nutz. I have anemones that do similar things when the weather get very hot for a long enough time and when the lighting change drastically for a long enough period. I have had couple sabaes before changing hands and none of them looks like yours in terms of shape. The earliest one I had owned and recently
saw in my friend tank is about five months and it did the same when my friend traded it home(I guess that's a big envirnment change.)