The buff (and song) window is not resizeable because of how the two columns of buff icons are positioned.

The space on the right of the group window is where the icons for ma, tank, etc go.

Ok , i see.
I play on Agnarr so the labels on the party doesnt come up i think.

I have blended your ui with several other pieces , and really enjoy it.
Altho i do get an error at first load , but everything seems to work heh.

Screenshot

Ive been trying to find an all open bank window that will work with it but no luck yet.

No idea why the server would have any impact on the group window, unless it's expansion limited ? Not sure if the icons for group roles are unlocked by a specific expansion?

The error can be ignored. It's because some unnecessary UI elements are flagged as 'required', e.g. the label that just puts '%' on the screen.

I don't use some of those because I use the <suffix> text instead.

You can kill that error by leaving those things in and commenting them out with
<!— —> that way the system sees them there but the yo doesn’t load them