3 week old from Wattcycle-Europe and they have problems all the time. I thought you have fixed the parallel problem!!
I have 2 - 12v 314A BT I parallel with busbars. Batteries are bought with one week apart and they have different firmware WT12_20004SW10_L447 and _L446, NO way to update firmware. The batteries behave strange under load. One show -1116 W other show -675 W during load at 1800 W.
When loading ONE battery at the time they show 1800 W or 143,3A and 143,5A, almost the same.
With small loads it is the same
I use "ExactMatch" mode and both batteries was fully charged before connection. The state of charge in % wary a lot when used for som time, one 85% and the other 63%. Or 100% and 85%. It differs a lot. It is always battery with firmware _L447 that show the lowest %.
I have tried "Compatibility" with the same result.
The "bind" dosent work, the app dont recognize the serienumper on eider battery.
What do I do to fix thise problems?

