Qustodio is not correctly classifying a website
Qustodio analyzes the content of each page each time it is visited. It then decides if the content in unsafe or suspicious, according to the rules you have set, and applies a category to that page. This process is continuously tested and improved, but can still result in errors sometimes, unfortunately.
To circumvent this problem, you can manually add any site that is not correctly classified by Qustodio site as a “web exception” in your Family Portal in Rules > Web browsing rules.