I have made what seems to be a responsive flexbox in the webflow designer (link below) in the About section of a website for a client.
If you go to mobile view and increase view-width you can see that it scales nicely. You can also see the the 2 light-blue lines underneath the Section heading text "A small decription of the section" are infact light-blue.
After I publish this page, the flexbox layout is not wrapping properly and the blue lines have some kind of grey in them aswell as light blue (see image below)
Some more info:
Live Page: http://naomiwilliamsvocals-f1b34c3cc4ba05084e5.webflow.io/
Browser used with Designer: Google Chrome - Version 50.0.2661.102 m
Device with discrepancy: iPhone 5 - Safari - iOS 9.3.2
Here is my public share link: https://preview.webflow.com/preview/naomiwilliamsvocals-f1b34c3cc4ba05084e5?preview=aca41a343eabf981619902d7c06560b7