Thank you for the quick reply. The success message and redirect work properly when I disable the signature plug in. This is the error I found when checking the error log:
PHP Warning: strrpos() expects parameter 1 to be string, array given in …/wp-content/plugins/contact-form-7-signature-addon/signature.php on line 215
I am not a coder so unfortunately I can’t do much troubleshooting on my own. If you have any suggestions it would be greatly appreciated.