App showing 0% battery but battery is fully charged

We just got a 6 SolarCam D1 Classic kit and installed yesterday. One camera was at 98% battery last night in the app but today shows 0% battery in app. It still works 100%. We took it down, turned it off & plugged it in. Solid green light. Left it plugged in for an hour and then unplugged and turned on. App showed 99% battery. Reinstalled it , reset the default area and then the app says 0% battery. It’s 100% still working, the app just isn’t getting the correct info from the camera. I’ve cleared the cache on my phone & that didn’t work either. Firmware is fully updated. Kind of at a loss as to what to do. The camera is not saying “Low battery” and is operating fine.