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Couple of things
Assuming you bed level before each print . Make sure the bed level command is the last thing before printing ! If for example you use a G28 ( home all axis) its resets the bed level data.
SO your start gcode should be something like
M107 : make sure the part cooling fan is off
G28 : home all axis
G29 : perform mesh bed leveling

You also need to research and understand Z offset. Its the amount below Z zero that's used when printing This is what you adjust to set your first layer height/ bed adhesion