@Nick-Sabs there is a potential solution documented for this issue by FM themselves. Check out this page: https://community.onewheel.com/topic/8/keeping-you-in-the-game
Here is the quote I'm referring to:
"My battery reading is incorrect on my app. What should I do?
Julian our all-star electrical engineer suggests that you leave your board charged overnight to essentially re-calibrate the battery cells.The battery is measured by one of the many battery cells and different cells may hold different amounts of charge over time. If you charge your board for a long period of time all the cells should balance in their charge."
Just toss it on the charger for 24-48 hours and see if it solves it.