For any MIME Types or Apache Handlers, you must add them in conjuction with each other, for a functional implementation. (Add matching MIME Type & Apache Handler in cPanel, for correct parsing)
An example of this is a .htaccess file within the directory of the program having issues with the following specifications:
AddHandler application/x-httpd-php .htm
AddType application/x-httpd-php .htm
Do not include one of the lines and not the other. Both need to be either in or out of the file.
If you still have issues send a support ticket.