Axial ratio seems different when Transmit Antenna stays at 0° and DUT at 0° and 90° Compared to if Transmit Antenna stays at 90° and DUT at 0° and 90°. Similarly, I checked other position, but it shows always different.
(Tx 0°-- Rx 0°, 90°) not equal to (Tx 90°-- Rx 0°, 90°)
(Tx 0°-- Rx 45°, 135°) not equal to (Tx 90°-- Rx 45°, 135°)