Odd Mechjeb launch problem....

[SignalCorps]

Not much of a 'problem' but weird. I have a craft sitting nicely on the pad, and I set up a launch to rendezvous with target, select autowarp and hit enable, and while time starts moving, I briefly hear the sounds of engines starting (then the noise cuts. Like a quick 'woosh') and then my craft is sitting at an odd angle

Now it doesn't fall over or act like it is off balance, it just goes weird. Does the same thing if I have supports too. Once launch time hits, it goes up like normal.

Also, several times I've been in the air, say around 30km, and on the map, it still says I am sitting on the pad, and the apoapsis marker jumps all over the place until I get into 'space', and then it's all normal.

[Foxster]

I've had a funny like this related to launch clamps. You think you have disengaged them and the craft flies off but then they re-release at ~20km, with bits falling away from the craft.