Report as inappropriate

@2urtle, I think you need to calibrate the bed and, if necessary, set the z-offset. For good calibration, you need to install Marlin firmware: https://www.thingiverse.com/thing:3249319
I had the same problem, recalibrating me helped. Also, before each print, I degrease the bed.

Anycubic i3 Mega / Mega-S Marlin 1.1.9 Custom Firmware - Extra Features & Quality Tweaks