% Charged is not changed if the shunt is properly wired as you are only reading in/out of the house bank. The difference between the % charged and Ah's consumed screens is that % charged is Peukert corrected and Ah consumption is not.

Draw 20 Ah's out of a 100 Ah battery at a 20A load and the Ah consumed screen will read -20Ah's. One would assume you are at 80% SOC but you are NOT.

Draw 20 Ah's out of a 100Ah battery at a 20A load and % charged screen will read 71% due to Peukert (assumes a Peukert of 1.25) and this is the correct SOC or as close as you;re going to get if the monitor was properly programmed.

Draw a load from the bank that exceeds the 20 hour rating load and you get less Ah capacity

Draw a load at less than the 20 hour rating load and you will get more Ah capacity..

The % Charged screen is Peukert corrected the Ah's consumed screen is not. Ah's consumed is only accurate if you drew the load at the 20 hour rate which is 5A for a 100Ah battery, 10A for a 200Ah battery etc.... Because loads vary, both above and below the 20 hour rate, monitor manufacturers include Peukert correction for a more accurate representation of actual SOC.

If you've not properly programmed the Peukert value all bets are off with the % charged screen. Properly programmed % charged is far more representative of actual SOC than Ah's consumed.