We noticed that some people's drawers don't open, so we took a close look and recreated the problem. And also immediately a solution ready:
On the manual you can find the part "J4" somewhere (In our case on page 15 section 20). This has probably come loose from the larger part. The solution we suggest is to fix part J4 to the larger part using glue (wood glue).
But we also glued part M4 (was slightly discarded, especially at the open ends) to part K6.