Without seeing it, or knowing more details, it’s impossible to say, but sounds like you’ll need play around with the responsive settings in the responsive editor to get things to display the way you want them to.
It can be tricky at first to understand how it works, but with a combination of trial and error, and using the bubble reference you should be able to get your head round it.
You’ll need to experiment with minimum width setting and margins until it works how you want it to on all screen sizes.