Hi @gehess,
As you are using the Autoptimize, I can not understand which JS file is causing the issue, as all of them are minified and merged by that plugin.
I do understand that you tested the case, but I urge you to follow exactly as I suggest here:
- Change the main theme of the website from the Child Theme to the parent X theme and test the case.
- Go to X > Theme Options and click the JS icon there, remove any code that might be there, and check the case.
- Go to the page in question and open up the page using Cornerstone, there also you will see a JS icon at the left section of the screen. Click that and see if there is a code there. If yes, remove it and test the case.
- Disable all the plugins except the Cornerstone and check the case. If the problem goes away, re-activate them one by one to see which plugin is causing the issue.
kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case if you still have problems.