Random text changes driving me nuts.

Ok so I don't know if this is an Atahualpa issue or what the heck it is from but it's driving me bonkers.

While I am editing an article on a totally random basis from what I can tell the HTML on my font's are getting changed. It can happen in the middle of a sentence, a whole paragraph, etc.

It seems to have started once I started using H2 tags more often to make subtitles.

It will be a span style like this:

<span style="font-size: 13px; line-height: 19px;"> my text here.</span>

But usually it will be so random like in the middle of a paragraph.

I am having to go through and manually delete them on every post and its super time consuming.

Help? Ideas?

Thanks!

Dani