Candy Coral Help!!

[BC564]

I have a candy coral colony with probably 250 heads and have been losing the heads. The flesh isnt shriveling up or coming apart or appearing to melt away like I have seen before. Instead the heads are huge and puffy.....look healthy but the whole head comes off and floats away and sits in another part of the tank....I have been worried about this coral for a few months and have been trying to find out what is wrong....is there something wrong? Is this a form of spreading and building new colonies? Looking for answers and thank you in advance.