Incorrect Tank Percentages for Mopeka LPG

Since upgrading to 3.5x I have found that my Mopeka Pro propane sensors are not showing the same percentage remaining as the app. They are off by quite a bit.

I have checked the settings and everything matches the app, even when I change the app to centimeters remaining, that matches the information on the GX display but when I go back to percentages and look on the display, it is off.

Any idea what could cause this?

Thank you - Brian