My wordpress transform my post titles to uppercase

Hey all.
I need to change something in my site. when i write a post, if i write the title with lowercase letters when someone view it, or share it the post title transform automaticaly to uppercase. how i can change that?
I search in styles but dont find the line who transform the post title.

(now if you can see the site (greek language) i write the titles in upercase letters because when i right it in lowercase the accentuation is wrong after transform eg. the “ά” transform to “Ά” not “Α”. and is wrong. I want the title to stay whatever i type it)

• This topic was modified 2 years, 6 months ago by Yui. Reason: moved to fixing wordpress

The page I need help with: [log in to see the link]