Karnallie

Since you manually charged the batteries after deep discharge, it's likely their internal SoC counters are desynchronized, especially if the BMS didn’t perform a full learning/calibration cycle. Fully charge both packs together in parallel until they stop charging (rest at ~54.0V). Let them sit idle for 1-2 hours so internal cell balancing completes. Then fully discharge both packs together until the first one shuts off or reaches 0% SoC. Then recharge to 100% — this gives the BMS a full charge/discharge cycle for recalibration.
Even if the voltage matches, cell imbalances within a pack can lead to early cutoff or SoC errors. Check cell voltage differences/pack, if any cell is more than 0.05V from the others then it needs to balance. Seplos BMS does passive balancing, but it can take many hours or days to fully balance a pack if cells are way off. Each individual battery pack BMS is responsible for balancing the cells within that pack

The left and right images are at different times - look on each image there are 2 LCDs: one top and one bottom which are the 2 battery packs.

As you can see the Pack Voltages are within 50mV of each other

No thanks to your AI response