I don’t think this is a bug though
Pretty much standard for all seasonal PvP currencies (honor point, conquest point, etc) to reset to 0 when a new season begins… such as what happened in the transition from DF —> TWW
The upgrade system being greyed out is also normal since the old expansion PvP season is over
What isn’t normal is for honor level to reset or go down, since that’s a “lifetime” measurement that carries over from expansion to expansion - similar to achievement points. If your honor level went down for whatever reason, that is definitely some kind of ongoing bug