Well, I imagine that the problem is that you used some fonts that the web server didn�t have.
You know, when you open a word document, if you don�t have the fonts, word will replace them for other ones, and that will mess up the whole document, because the size is different.
Take into account that this happens in the web server, but also in the computers of many users.
There is an option, when you save the document, choose to embed the fonts in the document (it only works with true type fonts).
You can also try to transform into images the titles that you make with uncommon fonts.