I saw that guild gift leve of the guild always at level 1 (0 exp/35000) but we did open a lots of boxes. Can you please explain this. Is it bug?
Well if you have opened guild boxes and its still showing zero exp gained, then yes it sounds like a bug.
To level up your guild exp box you need to collect keys, which you get when opening guild boxes. You sure its on zero, maybe show us a SS?
Its not a bug. By opening gifts you get keys to level up the sapphire box on the left. When you reach the 2.000.000 the box will open and will get you Gift Box EXP for the upper bar. I believe opening the first sapphire box is enough to level up to GuildGift lv2.
Let me know if it works.