LiFePo4 newbie asking

[bateraisepeda]

Hi everyone, i'm new in LiFePo4 (LFP) battery for my ebike. My battery is 48V 22Ah 16S, is it normal the LFP going down to 54V after charge while its charging voltage is 58V? second question is when I plugged this to my ebike (400W 48V ebike) and have a short trip to test, the battery is going down further to below 50V then stable at 49.3V in idle condition, after that the voltage is reduces slowly when in idle condition. Is it normal?

Thanks everyone!