Here in this picture you can see Loki up at the top of the stairs being the gatekeeper. He doesn't let Jujube pass, so she just sits on the steps. Poor Jujube.
I let them be. I feel sorry for Jujube, but I don't interfere. Loki's being dominant and territorial, so that could be a bad thing. But they have to find a peaceful equilibrium among themselves, because we're not always home. And they are at peace here, even if Jujube doesn't get to pass him.
He's not dominant or territorial with us, and lets her pass if we make him move. What do you think? A behavior to correct or just let it be?