I realize it's a feature of Browser Guard not Malwarebytes Premium and that Browser Guard is a browser extension. it is separate from the main Malwarebytes program. However, it's all Malwarebytes and in my mind it's all part of the same package. (Remember that user experience is not same as developer experience.) Clearly, the popup needs to identity the warning comes from Malwarebytes, and there needs to be some explanation as to what it is, why it has displayed and what it means. It's a great idea, it just needs some fine-tuning. It's interesting that anim8tr mentions seeing in connection with WordPress as that's where I saw it.
BTW, I find that Malwarebytes is a good, reliable and trustworthy product. So far I've not experienced anything that would bring any of that into doubt. Keep up the good work!