Does anyone out there know what the story is with QMC@Home?
Some time ago I somehow signed up for this and did a few tasks, and when the didn't appear in BOINCStats I must have put it to one side and then forgotten about it completely. I just noticed a reference to it in a spreadsheet I maintain and went to have a look, and there it is still going, with work Units to process and it made me wonder why it hadn't been picked up and adopted by BOINCStats.
Any ideas?

That's because they (still) don't provide stats (and the old QMC was retired anyway (thread here)). They've putted up the new website some years ago and went to a new URL, but with no stats so far. They had work for a while but then it got silent again a year before or so.
I was surprised also as the cleanmobility-app appeared in WUprop three days ago, so I went to see if they really had work and ended up with some WUs on my hosts.