I really don’t want to derail this tread about the reputation, but I feel the need to add this on the subject.
This is the most concerning issue to me out of all of them. I can’t replicate it, I have no idea what’s the cause, all I know is it’s happening to some people. Barrier between US and EU forums is also problematic as we can’t raise more awareness about it. EU forums also don’t really get checked by the devs from what I know and only way for us to reach them is through bug reports in game.
US Forums
From 303 to 66 (Has achievement for 300)
BUG loss of pvp honor after pre-patch, not yet fixed - Support / Bug Report - World of Warcraft Forums - https://us.forums.blizzard.com/en/wow/t/bug-loss-of-pvp-honor-after-pre-patch-not-yet-fixed/1915410
From 693 to 99 (Has achievement for 500)
Honnor level got reset - PVP / Battlegrounds - World of Warcraft Forums - https://us.forums.blizzard.com/en/wow/t/honnor-level-got-reset/1904475
EU Forums
From 414 to 1 (Has achievement for 400)
Lifetime honor level reset from 414 to 1, no resolution after two months of tickets - Support / Customer Support - World of Warcraft Forums - https://eu.forums.blizzard.com/en/wow/t/lifetime-honor-level-reset-from-414-to-1-no-resolution-after-two-months-of-tickets/523223
There are other people complaining but posting from Classic characters and I can’t inspect their armory link to verify they indeed lost honor levels.
Some people are assuming that the issue stems from pre-patch, but it does not. According to EU thread, this was happening prior to pre-patch too.