In Greek mythology Mount Olympus was the home of the gods and the site of the throne of Zeus, the chief deity.
The throne of Zeus moved away from Mount Olympus.
It says where the throne's home was but the throne still could have been moved out of Mount Olympus and returned at some point. I think the system was confused because the throne did not move in the text.
( z1 move :ARG1 ( z2 throne :poss ( z3 person :name ( z4 name :op "Zeus" ) ) ) :ARG2 ( z5 away :op ( z6 mountain :name ( z7 name :op "Mount" :op "Olympus" ) ) ) )