Woah, this is definitely not intended! I'm sorry you're having this bug.

If you can, can you share more by opening a ticket at support.malwarebytes.com please?
We'd be curious to know what websites you see it on, and the notification you are getting from Browser Guard.

Maybe related, but there are aggressive anti-adblockers that pop-up notifications that say Browser Guard is creating an issue (because they want to show you ads). These aren't from us.
There's more info here https://help.malwarebytes.com/hc/en-us/articles/41695202334747-Website-asks-to-turn-off-Browser-Guard.