This could be related to mod_security. Formidable is not saving custom styles or scripts on my server. I deactivated mod_security on the development site I'm working with and the script was saved.
I have a dedicated server and am digging into mod_security now.
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No such errors for me, i have jquery and normal javascript saving fine, I do notice I need to update formidable. "You have version 6.14.1 installed. Update to 6.15.1"
Here's a video demonstrating the issue: https://victorfont.s3.amazonaws.com/script-tag-not-saving.mp4