Ikea sofa bed PS cannot be properly folded

Hi,

I have the Ikea PS sofa bed and set it up according to the instructions. However, when I want to fold it from bed to sofa and first lift the front side as described and then push in, the front part of the frame lifts up when pushing in! That part should actually stay on the floor... Does anyone know what I am doing wrong?

I would be very grateful! By the way, if someone pushes the frame down while doing it, it works... But that's not a permanent solution.

I don’t know the sofa bed, but maybe it helps with problem-solving if I describe the steps as I understand them. 1. Fold up the front half until it clicks into place 2. Lower it again. the front part rolls backwards and the backrest stands up 3. the seat surface is rolled backwards until it clicks into the backrest.

and at 3. does the seat surface lift? how does that work when you press on it? something else would have to give way. where exactly do you have to press on the frame for it to work?