I am not too sure if I would call this an actual “Bug”, but it’s improper, and just started to recently happen.
It turns out that while in “The Grove”, you’re not able to use the Guild Bank, nor represent your own Guild. Me and my girlfriend both have tried this out, multiple times, and nothing comes of it. However, I was just curious and moved to different area’s, such as Lions Arch, and found out I was then able to Represent the Guild, and use the Guild Bank there.
I believe I would “consider” this a bug, but it’s nothing major, nor doesn’t effect me too much. Just thought I’d bring it up, if no one has already, I"m not sure if it’s happening in other ’Homelands" either. Just The Grove to my knowledge.