Inkbird app plotting function

I have an ITC-308-WIFI on an old freezer, by passing the thermostat. The 308 works well to measure the temperature and turn on/off the compressor. The first page of the app displays the current temperature shown on the handheld unit perfectly. My problem is that the plot in the Temperature trend chart doesn’t show the correct/current temperature. I can zoom in and out on the plot just fine, but the time history shown is not correct. It is not the same as if I record the unit temperature and time manually and plot them. Am I missing something, or is this a bug?