Abnormal tentacles and often bubble up oral plates are often result of chemical builds up (IMO) Are you changing your water regularly?
I often have anemones developed abnormal features like that when I let my tank neglect, improve when I take care of my tank again.
it is not the macronutrients like nitrates and phosphate, but micro-waste that built up in the tank again this is IMO. I never send water for indemp analysis. I know the remedy and the likely cause so I just don’t neglect my tank.