Font changes in Content Block when posted

For some reason when I create a content block, a different typeface is shown when placed in my content. This occurs randomly. I usually create the content on a page and then copy that page to the content block and save it. I have tried creating it in content blocks. Previously, this has worked.
See the bottom of this page under More Back To School. It picks up a typewriter font.

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