I have an issue quite long time now. Well, since I installed the 6.9.1 release.
The problem is that all help banners are displayed on a specific device. Note that I do not click on the help button. It's showing every time I access the Unraid interface.
I'm also using the Unraid interface on a macbook pro and a HP laptop but I'm nont facing this issue.
I've tried to clear my browsing data (cache, cookies, etc...), disabling all my blocking extensions (brave, ublock, etc...).
My browser configuration is almost identique on all my devices (except few more extension for development purpose on the HP and macbook pro).
My device is using Brave as browser and Windows as OS.
With my current knowledge of UnraidOS, I think this could be a bug.
You'll find some examples and versions below. Including the unraid diagnostic.
Version 1.22.70 Chromium: 89.0.4389.105 (Official build) (64 bits)
Here's some examples of banners: