Did a 2491 rated player really play in the U2200 section of this year’s World Open and get a horribly atypical result? I imagine the regular rating system is broken if this is the case.
I think there are wrong ID#s.
Judging from the worldopen.com website, it looks like Mackenzie Molner should be replaced with Jorge Salej-Higgins r/e, and Yian Liou replaced with Gisuppe E Boyer Censore in the U2200 section.
Both of these mistakes stick out like sore thumbs (two 2400+ in the U2200 section) and can be corrected easily but there might be others out there that are less obvious to spot.
Glad to discover that it was a mistake!