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Solved! Capturing the screen shots I noticed that the only difference was this battery had 'balance only when charging' enabled. The previous posted battery had that disabled. I changed and it fixed the SOC. Kinda weird that is somehow affecting SOC. Here is the other battery:

yes bus bar between the two. yes 100%. I thought the SOC was specifically set based on the cell voltage, and just an estimation. The bluetooth app shows that both batteries are discharging at the same rate. ie. the 10amps pulled by the inverter is reflected as 5a on each batteries bms. So...

ok, I think this is weird so I thought I'd post and see if someone can explain this to me. I have two 4s 180ah calb 12v batteries setup w/ overkill 120a bms each. I just got done top balancing both batteries. I'm running a test on these batteries. After balancing I tied the two 12v batteries...