Can't display more than one column properly

My presentation page originally had two columns with titles, texts, and links. I updated the text and title in column one, saved it, and when I refreshed my site, the second column and text had dropped below column one, stretching the whole width of the site, and losing the “Read more” link. Column one maintained it’s appropriate settings (position, size).
I tried to diagnose the problem by changing images and the # of columns. Changing the image didn’t fix the problem, and when I added more columns, they ALL dropped down below the first column and all stretched the width of the page.
I tried swapping the content from column 1 to column 2, and column 2 to column 1 – everything was fine. But when I reverted back to the original set up (which is how I want the page to look), column 2 lost its column identity again, stretching the width of the page, etc.
I have had to revert to just one column in order to have the page look ok, so you won’t see what I’ve described on my website.
I can’t figure out what is going on. I don’t expect anyone to fix this, maybe just give me some ideas on what steps to take to troubleshoot.
Thanks.
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