https://www.youtube.com/watch?v=V0fGm9GF26w
Okay, update! As Echo said (me and Sparker22 found this out as I posted this) it’s a joint problem.
How does the craft move? (CFrame?)
Is the blue plate welded? Joint welds?
Are we Filtering? (Not a cause of the problem in solo but good to know our options for implementation)
I don’t remember the specifics, but this is because the part is creating joints with the baseplate when you create it. Are you Instance.new() or cloning it?