The parquet flooring is warping and giving way

Hello.

I have the following problem.

We have parquet flooring in the living areas.
Laid floating (foil and cork underneath) on screed. Click elements.

Now the floor in the bedroom rises noticeably and goes down when stepped on. This occurs in the area of the door. Behind the door is a heavy wardrobe.
We have removed the skirting boards, expansion joints are present on the 3 free sides (one side is the wardrobe).

In a children's room this also occurs slightly, it is still completely empty.... Expansion possibilities are available on all sides here as well...

What could be the cause?
What can we do?

Looking forward to your answers.

Best regards Christian Mayer

Photos? Currently, it is such that in summer the parquet expands and in winter it contracts.

Perhaps the joints are not sufficient.

For us, it also appears rather wavy in summer.

I could imagine that the substrate with cork and foil might be too much for the heavy cabinet and that it then gives way so much that individual floorboards lift up