Some themes don't seem to be working properly on my fresh install of Ubuntu GNOME 16.04.
I've tried a number of GTK themes (using the Tweak Tool).
Specifically, I've tried the United themes (all three), and POP! But they all have the same issue. The top bar is very small, lacks detail and just generally looks wrong (see screen shots). Numix and Adwaita, which came pre installed, look fine.
I've tried researching the issue but nothing is coming up...
Does anyone know what might be causing it? Any way I can fix it?