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It is your first layer's height. ! have a few thoughts you might consider, without knowing anything else about your setup, but only the picture you have shown of the bottom.

  • recheck and calibrate Z offset on printer
  • recommend that you use a bed leveler, BLTouch or similar if you are not already doing so
  • check your slicer settings - the software creating the g-code does make a difference (ex, PrusaSlicer produces better machine code than Cura- let the debate begin) - seriously through, if you need to inspect the gcode with a text editor to make sure the Z-height is actually what you think it should be, it is worth the trouble
  • if you are getting good prints for a time, and over a series of prints start to see this happen on the 1st layer, you might also make sure that your bed height is not changing - & consider using more stiff springs than what ship out of the box.