Cameron Miles wrote on Thu, Jul 3, 2014 08:07 PM EDT:
The following games have all been recorded as wins for the wrong player under "Player Ratings":
http://play.chessvariants.org/pbm/play.php?game=Janggi&log=tamandua-cvgameroom-2014-84-966
http://play.chessvariants.org/pbm/play.php?game=Cetran+Chess+2&log=sissa-shatteredglass-2014-8-981
http://play.chessvariants.org/pbm/play.php?game=Cetran+Chess+2&log=sissa-joejoyce-2014-174-071
http://play.chessvariants.org/pbm/play.php?game=Glinski%27s+Hexagonal+Chess&log=fergus-cvgameroom-2014-128-857
This appears to confirm my earlier suspicion that the bug causing this was related to the "won" and "lost" commands (which I'm guessing are also implemented internally by presets with rule-enforcement, whenever a checkmate position is reached, as in two of the above logs), and that more such games could be found by scanning the list of finished games for logs where the color of the winning side is displayed instead of the winning player's name. But then, this game would be an exception (perhaps certain presets are "immune" to this particular bug?):
http://play.chessvariants.org/pbm/play.php?game=Alice+Chess&log=haltija-jeok-2014-160-090