What is this problem called and how do I solve it?

[omnilog]

Have you printed any bed leveling tests ?There are numerous STL files on Thingiverse or the Prusa Printables sites. Also lots of YouTube videos on bed leveling.Looking at the way the raised portion gradually fades down to level, that would be my first check.

I printed 4 different type and here the result.

[Bikeracer2020]

To me it looks like the bed is low at the rear, this is just my opinion and I am not an expert.

First, perhaps try increasing the 'Z' offset in the slicer settings by small increments, eg.0.02mm at a time.

When I had a similar problem of a badly bowed bed on a Qidi X-CF-Pro, I ended up using strips of adhesive backed aluminium tape stuck to the actual heated bed until a replacement bed arrived.
Even had to use a small amount on the replacement bed.

Somtimes needed a few thicknesses.

https://www.toolstation.com/aluminium-foil-tape/p97723