download a service manual for the 625 one touch system from the hwh website. go thru the diagnostics to get to the problem. if its going to excess slope, and you are sure that you are on a reasonably level surface, not more than 6 inches out front to rear, or side to side. you may look at the pressure sensors on the side of each jack. the front sensors have to both be seen by the control box to go to auto level. you may have to adjust or replace one of those sensors. there is a section that describes how to diagnose this problem. it also describes how to reset the pressure setting on the sensors.
excess slope is caused by two things. either you are too far out of level, and the extension (lift) needed exceeds the jacks capacity, or the pressure sensor is in need of adjustment or replacement. try adjusting first.