I recommend checking if there is a signal flow between these two heating locations. If so, then by looking at the schematic, you can find out why BMS heating. Here are the steps you should follow when debugging:
- First, check your component/IC bonding is correct.
- Check that the correct capacitor/resistor/transistor is used.
- Check your PCB for short circuits in this area.
- Try to check that the battery voltage sense wire reaches the desired voltage.
MORE: How can I fix a faulty BMS or replace it with a high-quality BMS while avoiding the disassembly of all battery cells?