More info is required to fully understand it, particularly how many times teams make it within the RZ in a game with us, what the avg # of RZ trips are for a team, etc.
If teams are rarely in the RZ against us, one score will speak more in that stat than teams that are often getting backed into their RZ and have more opportunities to produce a consistent percentage.
I'm gonna bet that speaks for some of that number. I'm sure they could stand to improve still, but I feel like teams are often not even in FG range with us, let alone RZ.