Solar Generation Not Showing Correctly on Web Portal Dashboard Graph

On my dashboard graph the solar value ('PV Power') seems to be showing at a fraction of what is actually happening. It seems to be reported correctly everywhere else though.

Anyone else getting the same?

Actually, I think this might be a local problem. It looks like only one of my dongles (on the the slave inverter, hence solar not reported) is communicating with the server. God I hate these dongles and their highly dubious operation......