My site is pickin up other styles when I make non-related changes

Often when I make a revision, like move a horizontal line or move an element, I get a flood of unwanted color in the background sections, or my 3 column gallery reverts to a giant single-column.

It seems to be picking up styles from somewhere —-when I have chosen to get the styles from the LOGO AREA (incidently, how can I get that to default) instead of the MAIN AREA.

Here is an example of how it should look. (I saved a ‘template’ of this element so I can replicate it on other pages)
http://www.tiikoni.com/tis/view/?id=e4171ec

This is what might happen: the font changes (see the top image) or the background floods:
http://www.tiikoni.com/tis/view/?id=5737099

—-hope this makes sense. I am afraid to make changes for fear of screwing it up.