@dognose
Testing continues with charging discharging problem. It is not related only to JK, JBD is also affected.
I tried battery voltage calibration by calibrated multimeter. Nothing happened. So I have compared data against Pylontech batteries and only what I can see is that Pylontech on the left has two MPPTs in “Voltage or current limited” and one “MPPT Active”
These data are before calibration, but there is not any difference, maybe little faster switching between charge and discharge without calibration. Also what you can see, pylontech battery calibration is 0.3V off from Victron VE bus all the time.
On the right is JK. Two MPPTs total both in “MPPT Active”. Besides of that, nothing special. You can see that JK is charging, discharging, charging, discharging… Pylontech is still. CCL from BMS is not the case either, pylontech can be still even with CCL 15A requested. So I am clueless what can be the cause - only mosfets disabled on pylontech comes to my mind…please help 
Maybe something in VE config? I do not know.
There is also
High yield → Inverter DC bus is going up → battery charging
Lower yield → Inverter DC going down → battery discharging
This picutre: CVL from battery is all the time 54.8V. In which world can inverter send 55.2V that is 0.4V more on battery busbar and later 54.6V. And why it sends battery power to the grid?
Edit next day morning:
I found maybe the cause or something that can be looked on and it is an answer to why DC BUS is higher than battery wants:
Check differences:
JK:
Battery CVL: 54.8V
VE.Bus System - Charge voltage setpoint: 55.20V
CVL < Charge v. setpoint
Difference MINUS -0.4V
Pylon:
Battery CVL: 53.2V
VE.Bus System - Charge voltage setpoint: 52.80V
CVL > Charge v. setpoint
Difference PLUS 0.4V
Also At pylon Charge voltage setpoint remains constant 52.8V. At JK it is always 0.4V above CVL.
In JBD BMS. Setpoint is changing by little 0.1V during a day, so I guess it comes from BMS? Charging and discharging issue is also present.