Distance between tag and anchors always under-estimated

[FrGrQuim]

Hi,

I currently work on a robot which use pozyx system for localization: on the edge of the field, the robot position is always shifted from more or less 20-30cm. After investigating, I found that the distances used to compute position is always under-estimated by more or less 20cm (when distance is above 2 meters). I have supposed that it come from configuration, but I didn't found any configuration that can lead to this problem. Did you already have this problem? If yes how did you fix it?

I share you a plot of different static measurements. The straight lines are the real distance (measured with a laser) the other one are the distances returned by pozyx.

Thanks in advance