When using the Classic Translation Editor, larger pages that are fully translated might display as only partially translated, such as showing 80% completion for a 100% translated page. This is usally caused by PHP configuration limits. You can resolve this by by increasing the max_input_vars setting in your PHP configuration.
Add or edit the following lines into your php.ini or .htaccess files, depending on your hosting provider:
max_input_vars = 10000
php_value max_input_vars 10000