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A screen grab would help.
Have you noticed the responsive icon beside settings for various elements, so you can assign specific parameters/dimensions etc. etc for desktop, tablet and phone?
There are also padding and margin settings to almost every element, you might want to check these, as they can be set in many respect to the device screen for responsive layouts.
Probably should check - page settings > page layout
Then perhaps, look at a section, check the "content width", options are full width or boxed.
I usually make all the sections the same.
Also take note of the "stretch section" that has a Y/N option, it's located toward the end of the layout tab.
I tend to set a section to yes for stretched and define a boxed section, say 900px wide and duplicate that section as many times as I need on the page.
I try leave responsive tweaking and fiddling closer to the end, once the design begins to gel logically and visually, otherwise you might end up chasing your tail.
Hope some of that helps. If you ever have a screen grab