Hello Good people of Emacs!

I'm having trouble exporting some math symbols from buffer (org-mode) to pdf file. 

Symbols are inserted to the buffer vith TEX input method.

**Inside buffer it looks like this:**
[![enter image description here][1]][1]

**I even get correct symbols in tex file:**
[![enter image description here][2]][2]

**Exporting this to pdf I get this:**
[![enter image description here][3]][3]

 - Do I have to configure some org-mode variable?
 - Compile with different Latex interpreter?
 - Any other ideas?

  [1]: https://i.sstatic.net/F0lRl.png
  [2]: https://i.sstatic.net/21074.png
  [3]: https://i.sstatic.net/E3Ze0.png