Hi Tanna,
Honestly, this issue of yours is very weird, never saw anything like this (kind of).
This showing shortcodes on the front-end issue has 2 common causes.
First is your Cornerstone is not installed/or not active, but we know that your Cornerstone is install and active so we can disregard this possibility now.
Second, is an syntax error commonly an unclosed HTML tags (<div>, <p>, <strong>, <br />, etc.), now I can help you check on this, the problem is your post Monster Hunter: World – Character Creation has some kind of “second-self” (as cat and as human) 
If I could just check that post as a cat, I could help you find the syntax error. But no, every time I open that post in Cornerstone it is showing as human 
Maybe you can remember what you did, or something happen before this issue?
And is that post Monster Hunter: World – Character Creation supposed to have the cat character?
Please do this 2 things, first deactivate all your plugins (except Cornerstone) and see if that resolves the issue. If it is, you know one of your plugin is causing it. Second save that Monster Hunter: World – Character Creation post as a Cornerstone template (.csl file), then trash and delete that post. Create a new posts with a slightly different title and import the Cornerstone template (.csl file) on that post.
Let us know how it goes,
Cheers!