piloted

It wasn't a very large plane, just a simple design I was tinkering with to accustom to B9 parts as I just installed the mod. I'm not sure whether it's B9 anymore, since I decided to make an all stock plane and the same thing happened. Things are just colliding with each other out of nowhere but with spaceplanes (SPH) only, my rockets (VAB) fly just fine with B9 parts.

Has anyone had problems with MK2 fuel tanks colliding with the fuel tank in front of it? I've been trying to make an SSTO spaceplane and the whole thing just blows apart once I get about a thousand meters off the ground. TWR is about 2.0 max, but they're the b9 turbojets at low altitude so they're still at the low range of thrust.