Wardrobe question

I put one of those canvas sorters in the wardrobe to store small things like potholders, a first aid kit, etc. and hung maybe 10 shirts inside our wardrobe so it wasn't overly heavy but when my husband slid it out to fold it down, the slide popped it's rivits (or screws or whatever it is that holds it on to the front of the bed)! He was able to fix it I think but I was wondering if you are not supposed to keep things in the wardrobe unless you are camping and keep it empty for folding down and setting up?

Has anyone else had this problem?