Hi Cheryl,
I’m sorry that you’re having this issue now, that is because you updated the X to the latest version (6.1.6), but not your Cornerstone (3.0.4), so now they become incompatible.
Normally we would advise updating your Cornerstone to the latest version (3.1.6) as well so they become compatible with X.
However, I saw that you have a lot of theme files on your child theme, and we don’t know if these are modified or not, in any case, please we advise to restore your previous version of X instead, and keep the Cornerstone (3.0.4).
Don’t edit page yet until the X and Cornerstone goes back to the normal/previous state.
I’m still investigating the italic accordion, I’ll let you know when I found the culprit of that.
Thanks,