After owning a few for nearly 5 years I will say one thing, these are hardy inverts. In my opinion I think your Anemone is okay and would guess that it is just doing its thing. If you fed it or changed the water they usually do this to expel their waste or water. Someone told me this a long time ago and I find it true to this day, but as long as parts of its tentacles are green and its not completely white (bleached looking), you have nothing to worry about. Make sure to feed it and give it plenty of light. I also find that if its tentacles are stretched, its due to poor lighting and/or hungry. I just picked up another RBTA the size of a dollar coin. These are fun to watch grow and multiply! Good luck and I hope everything turns out alright for you.
Keep in mind this is just my opinion and what I have experienced. Others may have their own experience.