The system thinks your starting voltage is ~10.8 volts. So either you started with a nearly empty battery (unlikely?) or your voltage divider calibration is wrong. Based on @Andreas_Hoffmann comment it sounds more likely your voltage calibration is wrong. I also plotted current for reference (scaled down 10x, so peak current of 5 = 50 amps).
If I scale your voltage up by 1.15 then pack voltage shows closer to 12.4 volts before takeoff. You can see the battery voltage die off sharply below 10.5 volts which is typical for some LiPos, especially under heavy load. I'm not sure how much flight time you were expecting based on your battery pack size. It is possible your battery is undersized or maybe you just have a bad battery.