Extruder doesn't stop extruding

So I have a Lulzbot mini that I use as part of my job, but for some reason when I turn the machine on and preheat the hotend, it starts extruding the filament meaning that it starts to gum the hot end up and doesn’t level correctly. Any ideas on what’s going on? :question:

Update: Just realized I should have posted this in the mini forum. If one of the mods can move it over that’d be great.

The mini should be heating the hotend to 140 or 150 C and then retracting the filament 15mm before wiping and probing. You shouldn’t see any ooze at that temp with the filament retracted.