Mushroom coral not opening fully

[Tangina20]

I came across old pictures of when I got my first mushroom coral and didn’t realize the change over time. My mushroom used to open to 1.5 inches long and spread far across the rocks and now I have hundreds and they look more shriveled up and less than half of an inch. Below are some before and now pictures.

 

[P-Dub]

They are looking fine to me. Doing just what shrooms do. Size is relevant. Worry not.