Editing posts messes up my site

Hi, Sometimes when I edit a previous post, it causes my index page to get messed up. Also the header and footer become misaligned, the background color changes, sidebar goes to the bottom. It doesn’t happen all the time – maybe 30% of the time. Its happening now – https://thecordblood.net/. I’m using v2.0.2.

I have solved this problem in the past few days by deleting the page I edited which caused the problem and recreating it (a horrible solution!), but now that is not even working.

Could anyone please help me? I would really appreciate it.

Mike