I have simlar problem with Daly 16S 250A BMS.
Everything is wired the same as in the picture.
All 16 batteries are visible on the BMS monitor screen with the values around 3.3v.
The voltage of 16 batteries is around 53V.
But as soon as I connect ANY load, even a small load like Cerbo GX which consumes maybe 5W, the Charge Mos and Discharge Mos are both turned OFF in about 3 seconds.
The current value with or without any load is about 44A, but nothing is getting hot.