Every time I start my game up,objects placed on slots are moved to one or 2 slots.
Its like this on the ikea bookshelf I downloaded too.
On my objects when I move a slot I re name the name hash and set the bone hash to 0x0.Do I have to rename and rehash already existing slots when I move them?
I think thats what might be causing the issue.

You need to set the bone hash to 0x00000000, try that and see if it works.

Edit: Not sure if you need to rename and rehash existing slots if you move them, I would try one or the other or both and see if it works.

wasn't this a issue after patch 1.26?

@bloombase I dont know :/

Yea I set the Bone hash to 0x00000000.When I made a dining table I moved the Chair slot and the only way it would work was if I changed the name hash ( I think, it was a while back so I cant really remeber )
But il see if it makes a difference.