When I enable dark theme, the banner becomes this
It’s been like that for months 
I had that too but then I did a shift + F5 reload and it appeared again 
Log out and log back in might work similarly.
This happens to me as well, but only sometimes. I think it’s probably something on Discourse’s side of things.
Never mind, it’s broken again
Oh yeah, I’d been meaning to mention this for months. Thank you for being less apathetic than me 
I didn’t realise it was related to the dark theme though. I’d been thinking it was the reviews counter script, but I guess not.