Okay. I get way more information on the desktop site. It looks like while the voltages are all very close the SOC is widely different between the batteries. My understanding, which could be wrong, is that the system is designed to balance the batteries automatically. I.E. Lower batteries will get more current to try and balance out. I've got the battery cables as balanced as feasible. Is this something that will resolve itself or do I need to take some corrective action to get those two batteries with the low SOC to get in line with the other ones because I think this is what caused the problems. Those two batteries went off line and didn't go back online until I power cycled them... at which point they started charging again but had fallen behind the others since the system had taken them down due to low voltage, but it was still charging the other 4 batteries.
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Your batteries are all balanced, indicated by the voltages being the same, and guaranteed by the fact that you have them all tied together in parallel. The reported SOC on each battery is different due to "SOC drift", which is a very common behavior. As Eric hinted, the way to correct the SOC on all the batteries is to fully charge the entire bank to 56 or 57V. The SOC drift behavior will be ongoing, and a full charge periodically will reset each battery to a good 100% reference point.
You should note that all of your batteries' SOC are probably wrong at this point. In your screen shot, 53.2V is pretty low for a battery that is under charge with a 56V charge voltage applied. It's possible that all of your batteries in that screen shot were near an actual SOC of about 20% or lower - nowhere near the 58% that some of them show. That's the reason some of your batteries "disappeared" - when you thought you were at 40% SOC at the start of the night you actually pulled the battery bank down to near 0% and a couple of them reached shutdown voltage.
If you're not able to fully charge your battery bank frequently, then you need to get in the habit of following voltage rather than SOC to know what your charge state is, and you need to use volts control rather than SOC control in your settings.
Here is a video that does a pretty good job explaining the "SOC drift" that you are experiencing. It's a very common behavior - my system does this too.
