Installation of EasySocial on top of EasyDiscuss causes URL-changes

Hi,
I have installed EasySocial on top of EasyDiscuss. The problem: Now I have two links to the same articel in Easy Discuss:

The "good URL" of EasyDiscuss:
https://www.piloten.at/forum/48-how-to-upset-a-passenger-without-really-trying


The duplicate & bad URL" of EasySocial:
https://www.piloten.at/discussions/48-how-to-upset-a-passenger-without-really-trying


How can I get rid of the EasySocial duplicate URL?

Thanks