Voice of the Berserker stops spellbar from refreshing

[scifo76]

I'm using Duxa UI.

Casting Voice of the Berserker. When it lands, none of the spells in my spellbar are refreshing. I waited for 30 seconds - nothing, they are all "greyed out".
My "get around" is to click any GCD item (shrunken, sow boots etc), and it fixes it, but it doesn't explain what the issue is.

Can any 59-60 shammy using Duxa UI try this out and confirm, please?

Thanks.