I can’t speak to what exactly the OP is talking about but graphical bugs (no tabard showing, no belts showing, shaman weapon imbues not displaying, etc) and things like world bosses not spawning or DMF not appearing when scheduled might be what they are talking about. My guess was that somehow things were thrown off with the “upgrade” to 1.14 but I really don’t know.
There were a bunch of things listed here as well.
Scrolling back through that post I find the OP posted there as well so this may be their beef.