Things that have worked for me:

• your bed is probably not level, i installed self leveling on mine ($30 but well worth it)

• if its adhesion, try a glue stick. It looks like a PEI sheet but that alone was not enough for me. My routine is: wash with soap and water, spray 90+% IPA (before bed is heated) and wipe with microfiber (paper towel leaves flakes behind), then apply gluestick before printing

• maybe check your bed is warm enough/preheat for longer to allow the whole bed to get to temp, though i doubt this is the case but it doesn’t hurt to try