The cause of the graph not appearing may be the app, but the unusual value in Q are very similar to the beta glitches I reported here.
Please use this thread only to discuss your personal experience with the testing of the PEQ feature and the beta firmware you requested. This thread should not replace submitting tickets as that route provides WiiM support with the necessary device and app logs to diagnose and hopefully fix any...
forum.wiimhome.com
We then updated the app on September 6th, but we haven't fixed this glitch yet.