Form Submission Does Nothing

Just installed version 6.3.27. Completing form, submitting, does nothing. Disabled the java, now completing a form and submitting, page refreshes to a blank white page. Attempting a refresh of the page met with prompt asking if you want to re-submit info (that’s the browser message). Form set for double opt in.

Enabled debug mode and there are no errors. No emails are being sent, no update to MailChimp’s list. No errors in found in cPanel error log.