3D Printing

like the title says i have an ender 5 pro and the bed is being weird. when i autohome it it works fine. but when i print the bed just stays at the top of the travel on the z axis for about the first 5-7 layers and then it will drop by over half a turn on the z stepper motor. leading to a large gap that cant be printed on. im using the latest creality slicer on standard settings if that helps any, maybe its a setting i havent turned off idk. id like to get this thing going as its been a few years since i got it and then i gave up.