Could be normal.
The Victron BMV measures actual current in/out of the batts. I noticed temp is 54 degrees... if you batteries are cold they will absolutely report lower voltages, even when they are full charged.
That being said you may consider re-calibrating the BMV when you know the batteries are fully charged.
RE solar and voltage, your batteries would ready anywhere from 12.8 - 13.6v when being charged. This is the blended voltage coming from your solar controller before being mixed in with 12v
draws and the battery voltage itself.
Hope this helps. Lead acid batts always mess with you if you try to pin down / associate their voltage with SOC given all the other parameters (temp, age, etc..)