Asteroids jumping/falling through ground

[Vall9X4562]

 

On my main Sandbox save file, ive been trying to land some asteroids near the KSC, but for some reason, every time i switch vessels the asteroids continously jump or fall through the ground. this is really annoying, as it means i have to continously revert or reload a quicksave just to recover them. Im running a somewhat-heavily modded KSP 1.2.2, and the asteroids have nothing attached to them when they are on the ground. Im not using any physics mods, and i don't think mods are causing it. Does anyone know of a fix for this?

EDIT: it seems it only happens when contolling them.

EDIT2: It seems it sometimes happens to other vessels too, but rarely.

Edited May 7, 2017 by Vall9X4562