Something weird with my Sebae

[geofrog]

I've had this Sebae anemone for over 5 months now and it has grown tremendously during that time. But recently I have noticed that it's mouth looks swollen, not gaping as I cannot see inside it's mouth. My water params are fine. It seems to be eating when I feed it, and there are no other signs of stress. Does anyone have a clue as to what is going on with my anemone?