SpaxTropp

This is kind of a new and confusing glitch I experienced when I joined my friends. 1. Last time I played, I left in the nether. So, now I'm stuck in the old nether version while my friends play the new one. I know, sounds confusing. Is there anyway I can fix it? 2. Breaking and opening doors: I can't break blocks near my home, but I can break blocks near my friends home. I can't open the doors to my home either and place blocks near it. The hell? I also can't open my door and trapdoor. If any of you know how to fix this or have an idea, I'm all ears.