Hi
I have developed an app and the responsive nature of the app works perfectly when I use it on the desktop browser/. But the responsive behavior goes for a toss once I use the app on my mobile browser.
Pretty much the only reason that could happen is if the minification process is messing with your CSS somehow. That shouldn’t happen, but if it’s that I would suggest making your CSS more specific to make sure it doesn’t get overridden.
There is no viewport definition in the HTML, so the mobile device’s browser doesn’t know how to handle scaling properly. Not sure how it can be working in your local deployment then.