Hi! From your picture I see bubble tip anemones, not long tips. Bubble tips split very easily and some never split. In my experience, if you have a specimen that splits easily, it will keep continuing to do so and so will the new anemones. To get them off the rock without harming the foot you can blast them with flow. I've even when as far as using a turkey baster and continuously squirting water at the base of the foot until it gets aggravated enough to move.
It also looks like you have some majano anemones. But I do see that you have a few bubble tips in the pic as well.