I have tried to - enable
Use jQuery & then save changes.
But after saving changes, checkmark
Use jQuery automatically unchecks itself.
I am not sure whats going on. Please help me here.
From the comments fo @OneTrickPony, I came to know that,
So, I conclude that issue is coming from the Theme itself. ( Not sure, but from the comments of @Milo & @OneTrickPony )
So, I uninstalled & removed