breeding

My chickens won't breed. I give them seeds, and they act like they are breeding, but no small chickens comes out of it... Anyone knows what could be wrong?

Hello! I am quite new to the snapcraft server and am trying out Skyblock first. I have quite a few sheep (and some cows and pigs) but at some point they stopped making new cows and sheep when breeding. They still get the hearts and come together for breeding, then I get XP but no new animals...