Note, this might be a problem just for PC. Console might have a separate key indicator depending on where the character is standing.
While doing a Visions of Enmity rift, I was unable to progress because the portal to the next floor spawned where the stairs to the previous floor are.
This means when I try to click on the rift to the next floor, I am unable to because all I can select is the stairs to the previous floor.
Edit: https://imgur.com/a/2oVd8yc
thanks for the help