Incorrect compilation of media queries

[edalis]

Hello
Excellent grid, thanks!
Incorrectly compiled styles, using media queries max-width.
Used Prepros (prepros.io)
What is the problem?

[Snugug]

Issue moved to at-import/breakpoint #161 via ZenHub.io

[Snugug]

Whoops, sorry, didn't meant to move this. I believe this is related to #218