i put all pillars down in the ground as far as they will go I know I built a big base with big Dino door already was trying to add on a bit to it so you can only build so much I had the same problem with the last base I abandoned cause the same thing happened
I have a whole base far away from this one that did the same thing I can't put anything on the floor an i could before I spend hours and hours making my base as perfect as I can get it