I experience a weird thing and it's not the first time. I was playing trying to go to the North-East zone on the map and suddenly the sound turned off, the mini-map and guns disappeared and after a while appeared a screen "Valle de Oro" sending me back to the base I was before. I repeated again and again and always the same. Very annoying. I just wanted to do the red control points and bases to finish the insurgency. I just did the whole story. Can someone help me?

I bought the game FAR CRY 6 to play online with another person. I played alone till the mission you can invite a friend or do coop. We continued together the story and missions till he got Chorizo (I joined his session). When I tried to get mine I couldn't. So I logged out and came back alone to try, in that moment I realized that I was in the beginning of the story, like I didn't do the other missions with him and I had to do it ALL again to get Chorizo the dog too.
I'm very disappointed because it means if I play alone I get the others amigos and go ahead on the story, if I play with someone I can't.
Is this an error or there is a solution? Can you help me? Thanks.
P.S: I love the game and the amigos, I'd like them all can come with me in the cars, etc.