125 Watt Solar Panel, Ctek, Tri-metric

So I am trying to better understand my solar setup. Running a 125w ZAMP Portable panel, with a CTEK and Trimetric. When solar hooked up Trimetric when set to AMP reading the reading fluctuates from positive to negative readings. When I run 3 interior interior lights, radio and fan the Trimetric will display amps between a positive 1.2amps. And a negative 3.0. Amp. The volts reading stay around 12.3 volts. Is this normal. All the components were installed by CampInn.. when I shut everything off volts go to 13.4 AMPs hold steady positive between 1.80 and 2.3.

I am willing to admit my ignorance when it comes to this stuff so any help would be appreciated… R