This can be caused by gantry misalignment/warping, or not registering the bed mesh properly. Also, maybe the bed is warped in some way that was in the middle of the test points, so maybe a finer mesh could fix this.

Given that this doesn’t look uniform, it looks ‘random’ – you need to check that your hot end is actually secure against the X carriage.

If this were uniform, like it faded out from a low spot - I’d tell you there was debris under the bed, or a mis-measure on the probe (it happens, they aren’t perfect)

ABL isn’t a solution for leveling problems. ABL is a ‘lazy’ test for an already-well-tuned printer. If you’re having leveling issues, an ABL won’t work right because it assumes everything is working perfectly to begin with.