that lines up with what we've seen. we've been able to find a way to consistently replicate this, both for your craft and from scratch, and we're pretty sure we know whats causing it: for your craft, @Spicatdiscovered its the panels on the back that are to blame. in general, it seems like this bug is caused by copying a group of parts and connecting them using nodes that are not on the root. from here there are a few ways to trigger the bug; saving/loading twice, undoing something then doin