On PL version - hidden link - everything works fine, but for example on the hidden link when you click on any tab in RESIDENTAL ROOFING or COMMERCIAL ROOFING it throws a 404 error or a news page, as in the screenshots. Sometimes the correct page appears, but it's very rare.
The same problem also occurs on the production version - hidden link, in all language versions, except the Polish version (the default).
Could you please update your WPML plugin to the latest version 4.6.5 and add-ons to benefit from the latest bug fixes and improvements? This may not necessarily resolve your problem, however, in order to troubleshoot the issue best we need to work on the latest code available.
You can check the latest released versions under "My Account -> Downloads" on this site. Instructions to update can be found here: http://wpml.org/faq/install-wpml/
Please remember to backup your database first before you proceed.
Let me know if the issue persists after an update has been done.