If you delete anything from the theme.
You should do a manual re-installation of the theme.
All working properly on my localhost.
Please update your plugins, if they are of older version.
For all other plugins you have and not listed above, Please disable them.
Don’t enable cache plugin.
Then proceed to enable one at a time and check your checkout page.
Doing it this way and you will know which plugin is producing script that break your website.
Please have patient and do it properly, don’t skip any step.
Don’t do anything I never mention here.