Voltage reading difference between Switch-pros and Solar Charger

Hope this is the right place to post this thread.

TLDR: my solar charger and battery monitor are telling me the battery is at ~12.47V but my Switch-pros is saying 13.40V

I installed a solar panel last week along with a Victron SmartSolar 75/15 and Smart Battery Sense.

I have been running my fridge this week trying to get an estimate of how much power it consumes and how the panel does at keeping the battery topped off.

This morning it was down to 12.47, which I think is okay for AGM but I decided to turn my fridge off just because there's little sun this morning. I noticed that my Switch-pros is reading 13.40V.

This is concerning for me because I rely on the SP's low voltage disconnect to turn the fridge off at 12V.

I know wiring can account for loss, but the battery sense is literally mounted on the battery with maybe a foot of lead wire. Seems like the chances of both Victron units having the same amount of loss is unlikely.

Battery is an X2Power 27F AGM in case that matters, and all wiring is OFC, sized for each device based on manufacturer's specs. The fridge is also reading 12.5V in case that matters.

I am new to solar, so I could be overlooking something completely.

Any thoughts?

 

I'd check the bat with a decent multi meter see if it correlates to one of the readings and go with that device if it does.

 

It looks like it was pretty close to the SCC numbers.

I'm honestly not so concerned with knowing the exact voltage as I am with why my SP would be reading so high and potentially not disconnect when the battery gets low.

I did reach out to Switch-Pros and they suggested a restore to default (should've known) and that got the numbers much closer together. Hoping they can provide some insight into why it got so far off in the first place now.