Hello, i explore this bug after i made my own guild. How? Me and one my friend always doing some daily quests and stuff like that every day, and after we created our guild 4-5 hours later we saw that our guild is still 1lvl. Then i left guild and created new one and same **** just heppened. Both of us spend our golds for guild tabs and etc, and this thing that we can't lvl up guild is so annoying, we hope you will fix it in next 5days, if not we will spam you every minute. Thank you.
Guild experience does work, as Repc says its just a bug with the experience bar. You and your mate do daily quests and you'll start seeing the levels go up. I suggest doing your profession dailies and the mop reputation dailies. Even 2 people can get a guild to level 10 in a few months.
if you hover over the exp bar it tells you how much exp it still needs if you do some quests and then do /reload it should update to the new experience you need