leave it unchecked, it has no value for calibrated data (we discussed this here)
I also noticed that the geolocation quality of ALOS-2 product strongly varies, mostly because of the orbit information. Where did you get the data from and in which product level?
I noticed Level-1.1 provided by JAXA can be ordered with “high precision” orbit or “most accurate and available” which soulds quite similar, but I asked them and only the first one grants that they process the orbit information upon your request before delivery. It takes a bit longer but the geolocation is higher.
