First check whether the fixing screws (refer to the picture, 4 left and right) of the top beam of the gantry frame are tightened? Is there a slant on the mount? Try using a wrench to tighten it up.
Check whether the fixing screws of the hot bed (refer to the picture) are tightened? Try using a wrench to tighten it up.
Refer to the tutorial to remove the heat bed, and measure whether the lengths of the 5 spacers (refer to the picture) under the heat bed are the same.
Disassembly hot bed tutorial: How to replace the soft magnetic film and hot bed | Sovol SV06 - YouTube
After checking the reinforcement, re-flash the firmware, and then try to run Auto Z-align and Leveling Bed, that is, re-leveling.
Firmware link: Firmware Download | Sovol3d
Flash firmware video tutorial: How to flash the firmware | Sovol SV06 - YouTube
Leveling Tutorial: How to level the bed | Sovol SV06 - YouTube