Installing default font from "Font Installer" app only changes partially. How to apply it globally? I rooted my LG G2 D802 and changed font using Font Installer ★ Root ★. Then I changed my mind and changed the font with the one which came already in the phone. But the font hasn't changed in the whole smartphone. 

The rooted font exists in some apps like Play Store and the stock one in the rest of the smartphone! 

What can I do?  

(Click image to enlarge)
You will have to find someone with the same phone as you (rooted) and find the font files and send them to yourself and copy them into the location of your font files and do a reboot. Worked for me. Or you can find a dump for your phone and download those files and find the font in there and place those into your font files. (Friend did that and it worked as well. I have warned people not to download that app as it ruins the font settings.