Direction of Activity Associations change in the GUI.
Repreducible example:
1. Create an ActivitySet
2. Open the Diagram of the ActivitySet (right klick -> Open)
3. Create ActivityInitial, Activity and ActivityFinal and connect them with "Associates" Relations in this order
4. Close the Diagram
5. Open the Diagram
Result: The Relation from Activity to ActivityFinal has changed its direction
this impact also the check on the webbrowser