You appear to have a rule
#content {margin:30px;}
that is screwing up everything as there should not be any left and right margin on content. If adding left and right margins on content, they MUST be in % and the width % must be adjusted as well, or else the total will go over 100% and cause the stacking.
if you added that rule remove it, you have top and bottom margin boxes available in main options > Content areas as well as left and right padding boxes.
If you did not add that rule, check in Main options > Fonts & Custom > Custom CSS Rule box to see if it came fro a sub theme and remove it.
You also appear to have a broken HTML structure, as the Secondary sidebar widget area is ending up in a Font tag… (<font color=”#030e24″>) which is not right
You need to run your content through an HTML validator to see what could be causing that and fix it