Kerbal Space Program

When I try to launch my rocket as soon as I load part of my ship is no longer attached when it should be and what makes it weird is that it doesn't fall off it is just floating slightly above the ground as soon as I load in. When building the rocket everything is attached as it should, the issue is only shown when I try to launch, i have already tried rebuilding that part of the rocket and restarting my game but nothing works.