big objects slide, while small ones don't

Hi everyone! I'm using plane detection by Google's ARCore in order to place an object on a plane and (hopefully) keep it stable while I'm going around it. When I place small objects (let's say 1m x 1m x 1m) they are VERY stable, but when I enlarge them (through the transform-->scale menu) for let's say 10m x 10m x 10m it's very unstable, I start walking and the big object just slides on the surface following me. I thought it might be an anchor problem, so I set the anchor to be in the point I hit the plane, so it's always stays visible to the camera. I also attached the object to 2 types of anchors- Trackable & ARCore Session. both of them didn't help. I ran out of ideas, does anybody have one? :) THANKS!