Not too sure what I need to look at 😉
The position of one of the stacks is a bit up and I can see you have stuff intersecting in the bottom left.
Is it one the models that has not been built accurately?

Yes, that 1x2 white modified plate is a bit up. 😃

"you have stuff intersecting in the bottom left" - oh, maybe that's the problem, I will check it out!

Ahha!

Sorry for bug reporting, I think it's my fault. 😃

All good 😉