Telemetry problem Pozyx

I am working with non-gps indoor set-up. XY coordinates are given by Pozyx (115200 baud rate). Everything works with usb connection (even if i have some drifts in the position), but using the telemetry module (57600 baud rate), i just can fix the position, but it doesn’t move on the map. I tried to pass the SERIAL1_BAUD = 115 instead of 57, but nothing changed. any suggestion?