Erick,
This is typically a result of either your page or your database column having the wrong character set (charset) encoding or in the case of the webpage, no encoding declaration whatsoever.
Make sure at the top of you page, after your opening head tag, you have encoding similar to this:
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
Try that first... if that does not fix the issue, then it means the charset encoding on the database column is incorrect.
Best regards,
Brian