Plugin does not show equation in front

Hi, i have a problem. I’ve installed Equation Editor in a fresh installation of WordPress 4.9.6, the plugin works well in admin but in front dont show the equations well. I’m using the default theme Twenty Seventeen.

Steps:
1. WordPress install
2. search equation editor plugin, install and activate
3. modify default post Hello World
4. add a equation (https://tinyurl.com/ydfa332l) and press update button
5. go main site to view the equation, and here is the problem (https://tinyurl.com/yclhq38c).

How can i solve this issue?

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