I think that something became broken in GS integration. I use http://beta-businessmanager.sdlproducts.com TService org. Username Yuri
I tried to link the BM project to my GS today and got a list of not my projects and GS organization see below:
It's seems that is SDL GS server not mine defined in the integration tab.
Absolutely strange error. I've just logged into your instance and got correct list of projects to link, not as on your screenshot. Looks like the problem is deeper.. Will be investigating and keep you informed.
Thank you very much for reporting!