WordPress unknown page!!

Hello,
I have some problem that i can’t even descibe.. but i’ll try..

So i have created my own theme.. after updating wp to 3.8.1 ( i think becouse of that ) the website brown down.. and now if i try to go to front page, any 1-st level page it shows me same content.. i.e. front-page.php template file..
and if i do var_damp( is_category(), is_page(), is_single(), is_front_page(), is_home() ) it gives all FALSE ..
Also if i change theme to eny othere it’s not working ( showing same content on all pages )
It only happends if permalink structure is “preaty” – as post name..
Can enyone help me ??
website: https://titanmed.m7-pro.ru/