When you connect to Powertap P1 pedals over Bluetooth® you can only connect to one pedal (either left or right pedal) and the power displayed in RGT is half the total power.
This is a known issue which we are investigating further. Other manufacturers have addressed this issue through their mobile app by allowing power readings to be doubled if only using one pedal, but Powertap app does not allow this.
Workaround:
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In order to display the correct power you will need to connect to the pedals using ANT+ following the Pairing to RGT with ANT article.