JK BMS - showing faulty values

For several days I have been noticing that JK BMS shows that it remains ZERO battery cappacity but I can use batteries for next hours.
Besides today in the morning it has showed Battery Cycle :4 but now in the evening it shows Battery Cycle: 333 .
During the last app. 3 weeks I had 4 cycles, so it is very stranges having 333 cycles.
Do you have any explanation?
Thank you

Which BMS model, and what is your battery configuration? JK "State of Charge" in the newest units is based on a complex algorithm, IMO somewhat unreliable unless the BMS has been "trained" by reaching both maximum charge voltage AND minimum voltage a few times. I do not like the notion of dragging my own JK-equipped battery pack down to such low voltage, merely for the sake of enjoying correct "Battery Cycle" counts and more reasonable SOC readouts.

I use an external coulomb counter for estimating SOC in the "wide middle" of nearly constant voltage SOC conditions, ignoring the apparently much less reliable numbers which JK presents on the cellphone app.

Ping @Nami about Jane's Question, Why would the BMS show Battery Capacity 0% and Cycle 333 ?
* Note to readers, Shenzen & Chengdu are presently in Lockdown, a response may take some time.

My battery configuration: 16 cells, 3.2V 280Ah each
My Model: JK-B2A24S20P
Can anyone provide a procedure how to train BMS?
@ rickst29: Can you recommend external coulomb counter?
Thank you