You do not have any space in your quest log!

[mh66]

As stated in title, HB does not abandon old quests so char can't accept new ones. I had to abandon manually - char is level 96 and I had to abandon quests from MOP and even Cata

 

[vhb0982]

I dont think the bots knows which quests to abandon my view is it should be up to the user to clear the quest log first.

 

[mh66]

As far as I remember when I leveled chars with HB2, HB did that automatically. I never had that much old quests in my chat log so HB couldn't accept new ones