Assemble 35cm Ikea Pax extendable clothes rod

Hello!
Following problem: We have two Pax cabinets 100x35x236 standing next to each other and of course connected to each other and each fixed to the wall. We have sliding doors as doors. On the right cabinet unfortunately there is way too much space between the inner walls. Shelves could still be mounted, but only with gaps on the sides. The pull-out clothes rail does not work at all. Due to at least a 10mm difference, the screws turn directly in the inner wall.

Does anyone know this problem and can possibly help me?

Best regards from Hamburg!
Paul

To understand: the assembled wardrobe is too wide on the inside? For me, the only conclusion is that the wardrobe is not assembled correctly, somewhere not pushed together properly. I would probably take off the sliding doors again (a real hassle, I know), unscrew the rails, and take another proper look at the wardrobe.

Reads as if the outer sides of the weight are being pushed apart.

Is there a photo? Was the back nailed on when no pressure was applied from the outside?