I'm not building them in the bay, I use sub assm. If I try to build them in the bay it still happens. This must be a mod conflict. Mods: Toolbar, ATM, B9, Editor Ex., FASA (launch clamps), FAR, Firespitter, JSI, KAS, Kerbal Engineer, KJR (I think this might be the conflicting mod), Klockheed Gimbal, KSO, KW, Infernal Robotics, Navy fish docking adapter, Near Future Construction, SmokeScreen, Tac Fuel balancing, Tweakable everything, and tweakscale. Thanks for the help so far btw