@26, PanBB does not exist. The link entitled PanBB links directly to https://punbb.info. So yes, someone has been fucking with the themeing of the site, though I have no idea why. A PHP update does not cause this kind of behavior.
Update: it apparently does, though is in Russian. So I'm guessing that the site has either been compromised or Sendermen/ritchard is messing with things, though why he'd want to is beyond me since even the latest PunB works on PHP7.
"On two occasions I have been asked [by members of Parliament!]: 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out ?' I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question." — Charles Babbage.
My Github