Ikea Pax Lyngdal sliding doors are slipping out of the track

Hello,
I'm already desperate. The first sliding door constantly slips out of the track when you slide it back and forth.
So I continued to assemble carefully without sliding it back and forth and: Now the doors are completely installed and now it has slipped out again during normal use. This can't be true!!! Take everything apart again??? Does anyone have advice, everything was done according to the instructions ... clueless.
Thank you

You mean the interior door? I guess you're talking about the small plastic parts on the pieces where the rollers are also attached. You have to turn them inward before hanging them up. At least, that's always been the case in the exhibitions, where it didn't fit otherwise.

@ Balto: yes, exactly the inner door. But we set the checkmark exactly according to the instructions, first horizontally, then vertically... the door still slips out of the guide...

Hello,
has a solution been found for the problem? I basically have the same problem and would finally like to install the doors, thanks.
Best regards