The LCD display will show you the battery pack average Voltage measurement at the moment.
Whenever your bike starts moving, the power consumption goes high as there’s more power needed to break from a standing position. This will show as your battery voltage dropping and the current consumption increasing. The current consumption can be seen in the Watts measurement.
Volts x Amps = Watts
After the bike starts moving the voltage measurement will go back to normal power output as the current consumption will decrease.
The more demand, the more the voltage will drop while using the Ah charge. This is also what happens when starting up a hill as the power need gets fulfilled.