Ok bms

Anyone one have an idea what a " current sensor anomaly" is on a JKBMS. China is under lockdown so no one home

Your BMS have an internal sensor that measure charging and discharging current from/to the battery.
This sensor is providing a specified range of measurements to the BMS internal logic. This range is usually equivalent to a value from zero to the maximum current supported by the BMS. Any value outside of this range could be detected as an anomaly. If the sensor is faulty and not providing any range, that is also considered an anomaly.
Current sensors, from magnetic to shunt types, are actually actively detected by an electronic circuit because they provide a zero signal even if nothing is connected or is passing through them. For this reason electronic circuits can easily detect if they are missing or not working properly.

Any idea why my bms is randomly triggering this alarm. A particular setting. My batteries are full charge with a small charging current

Current is measured by a number of large low resistance chip resistors distributed in parallel down the length of MOSFET's. The BMS measures voltage drop just like a normal battery monitor with current shunt.

The most likely failure is one or more of the chip resistors have a fractured solder joint. They get subjected to a lot of hot and cool temp cycling during use that puts a lot of thermal cycling stress on these components. The no-lead solder paste used for SMD PCB's is also more brittle than old lead based solder.

If you have the capability you can try just resoldering the termination ends, adding more solder.

Which JK BMS do you exactly have? It could be an idea to try to exclude any hardware problem before to understand what could be the cause. Is the current reading normally working through the whole range? Do you have the current calibration function and did you calibrate the device? Is the issue occurring only after the balancing phase?