I ran into one of these today and I have seen a couple in the past, but I've never really thought anything of it. If I see any in the future I'll post the case numbers here.

Case #5808612
Four opponents reported the player in game one for offensive language and the chat is virtually empty. After game chat, maybe?

Case #5807920
Reported for offensive language by opposing team member - no chat from the player and no chat from any of the opposing team, either.

Huh, I just assumed they were false reports, not bugs.

Case #5813270

For me first game missing all of chat.

Wish I'd seen this thread earlier. Had a case today where I'm fairly sure chat was bugged, I've had cases where there was no chat at all. Think I'll bookmark this.

case #5817869
enemy reported but the reported player said nothing at all and the ally team didnt ask for the report neither did they file one.
there is something else i have seen it seems there is some kind of problem with the mute option and the tribunal in one case they reported someone who was saying stuff to the enemy team (and that was true) but somehow a player from the allied team said that they had muted that player at the beggining but i saw no reason for that as there was no verbal abuse or anything to that matter
case #5826447

Bumping because wow, Tribunal forums suddenly went crazy.

Again with the bump, what happened to the forums? Did a huge banwave go out or something?

Case #5833692 - Game 1 (to me): Two ally reports for different things, even a report request in allchat, but no ally teamchat at all.