Fortification Betrayal League Instance Stuck Outside of Act 10 Vilenta Boss Arena

https://imgur.com/cjvD1sj

My title summarizes what I'd like to convey, but I took a picture to illustrate it further. If you look in the upper right-hand corner, you'll see the mini map, and Betrayal icons. Those (and the off-screen Fortification which can't be seen) shouldn't be there, because that's terrain I can't access.