Just a heads up...
Last night I noticed while doing my world quests that I was around 400 honor from Honor 150, so I decided to head back to Broken Shore to complete two fast PVP tower quests to cap it out and go back to questing.
Instead when my bar filled I was greeted with no achievement or mount. Confused, I opened my achievement panel and saw that the date on my Honor 125 achievement had refreshed itself and was now showing as yesterday's date, yet my in-game honor level is displaying as Honor 129.
Since expac launch I've done exactly two random battlegrounds and two PVP tower quests and various warmode kills. Not nearly enough honor gain to go from 125 to 129 in a 24 hour period.
I've ticketed it, but so far just received generic advice about logging in and out of all my toons, which was obviously the first thing I tried.
So a heads up, folks; keep an eye on your honor level, not only are the high prestige players from Legion punished with dual rewards, but sometimes the achievements themselves bug out and overwrite their dates.
Well coded, eh?