Maybe it is caused by commenting out the charset meta tag? You should have this in your header:
<meta charset="utf-8" />
You can see in your source that this meta tag is commented out - maybe while debugging this problem.
Additionally you could check if your database settings are set to utf8_general_ci or the recently by Wordpress implemented standard utf8mb4_unicode_ci (COLLATE) in phpmayadmin.
You could as well check if your templates are saved as utf8 and insert the content by first pasting it into an text editor that removes unvisible formats. Sometimes if you copy text from a pdf file you can have issues with some characters.