FlexPendant Developer Support bug?

Hi, when I try to access the documentation from here https://developercenter.robotstudio.com/flexpendent-sdk , i get this menu. 


But when I access it from a link I got from a colleague I get this menu:


And if I then open the topmost menu item, the menu disappears again I have to access it from the link to get it back. 
Systemintegrator - Web / C# / Rapid / Robotstudio

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