@killjoy1987 Don't worry about that - I know what you mean. You are seeing the disabled version of the button, that's why there is a no entry sign when you hover over it. Normally if there are unread notifications, the button should be active, so not sure what is happening there.
I can't seem to be able to replicate this, I'll have another look into it. Do you get this if you login from another browser or Incognito?