I know this is on a small scale of people who resize their screens while using a website. If a mobile menu is open and the screen gets resized the menu stays open. This either ends up having duplicate menus shown or having an unstyled menu shown. I have uploaded an example of the official Bricks website doing this. But I have this happening on my current sites and I have seen many bricks sites that do this.
Hi Jesse,
Thanks so much for your report and welcome to the forum!
We are aware of this and do not perceive the behavior as bug. As you say yourself: who does that and would it really be expected that the menu closes then? I’m not sure about that.
You can work around this by adding the mobile menu styles already on the desktop breakpoint 
Best regards,
timmse