I could be wrong, and the sensors are fine. I noted on October 25th that you did get a good DHW run, so it is possible to get good performance and/or good data.
Edit: more specifically, the first reheat of that day was good, but the other two were poor: link to time period - maybe it’s affected by the temperature of the tank?
I think this is what the heatpump factor is for, typically around 0.45. There’s a button on the app to work it out for you - tick “Show as % of carnot COP” to get the magic number for the current window, then untick it to show the simulated heat output. It will vary quite a bit as you move around, so try to set it on a “good” bit of system running.
