I assume you got one of the Creators.
Beds on these tend to distort with temperature, so if you preheat to 120 it's good to recalibrate.

I would also advise to remove one of the springs from the print bed to get a 3 point leveling (left-back is my fav), with 4 points you'll always get tension on the bed. If the bed is warped by default, you can try to use the 4 screws to compensate the warping, though.

Dreamer comes with glass bed and 3 point bed calib by default.