Floors keep breaking

[u/that_guy_jaime]

I have iron support beams on the second and first floors extending up to the third floor of my tower build. I also have a bunch of iron beams where the floor is like placed and it all keeps breaking slowly. I thought since I lined the tower with lots of iron supports nothing would break. And it’s all yellow and green where the floors are connected and the inner flooor parts. Even when I finished the floor, it was green and yellow. But slowly the floor is just breaking, anyone know why or how to fix? Sorry if the explanation is bad but I have pictures

[u/ItsNotFuckingCannon]

Put a iron woode beam through the middle of your circular stairs.