Yeah, like Johnny said, check your CA. This is also a reason for tentacle dropping and polyps dropping off.
I personally have never had them “throw or drop” a tentacle if they are in a location they are not happy with. Every time its been a deflated polyps.
Maybe check them out at night, I happen to be looking in my tank one night for a "snap maker" when I saw my clown loping off a tentacle that was twisted up.