Missing links in Footer Call Out

For the website www.ibs-europe.nl I used the theme Quality-Pro. Client was happy and everything worked fine. But after a few months, the link of the Footer Call Out does not work properly on every page anymore. It still does on the home page and some other pages as well, but more and more pages show an Error 404 after clicking on it. Very strange, it is the same link! What can have caused this? And more important: how do I solve this? Please help!

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