Special characters like " ã õ ç are transformed to HTML in text fields

I registered a few hours ago and everything has been awesome! Great job guys :)
I just found that for example:
 " becomes "
It happened in some "titles" and "steps", however this seems to happen randomly, maybe because of a particular character... I'm using the Portuguese keyboard that contains: ç º ª ´ ` ~ ^ " and ¨