it seems to me the problem in html format in theform file so try to open it in the source by notepad++ editor
and copy it then go to theform file in the site and open it
select all delete it and past the source in it then save .
any way i'm here for your help at any time and as i said before you can send me login page to file manager details and i will
install it for you and you can change details after that.