I'm not sure what you mean by this. Could explain how it indicates that your power meter is on the right. For a single sided power meter there typically is no concept of side.
I think pedal smoothness on single sided power meters chooses a side. Intrigued as to how this could be wrong. What power meter is it and ANT+ or BT pairing?
It is a single side with ant. The powermeter is from 4iiii. He is on the left side. But I can not selected the side in my Garmin. There is the power on the right side.