As i was trying to build a submarine, i tried to use the quick copy feature wich up to that point had worked normally.
i tried to copy a rotator with a wing on it but what happened is that it copied the rotator to the other side but it copied the wing to the exact same side it already was, basically overlapping it. Moreover when i tried to use the mirror effect again, all things copied to one side were duplicated on top of one another. This was really frustrating because i had to load a previous save with much less lrogress
I think I found the problem
While every other part was copied on the y axis, along the sub, the rotator and the wing were copied on the x axis, effectively copying the on top of one another.
I still don't know how to fix it