Possition diference while driving or stationary / IMU fusion setting

Hello,

I would like to ask for some help or at least an explanation. I just finished my first tractor upgrade to Autosteer with only one antena and IMU. Before I always used dual antena setup and worked great. Now I am notocing that I have a difference in possition shown on AOG while I am driving or being stationary.

While I drive with Autosteer enabled it ususlly show that it needs to seteer 5-10 cm to the right…But even if I drive for some distance with autosteer enebled it doesn’t come close to zero - looks like it just don’t give a comand to the valve to steer more to the right. But if I just stop the tractor while autosteer enebled this error goes to zero or close to zero - meaning I am on the line.

I even drew some lines on the asphalt while calibrating the AOG and tractor is possitioned accurately on the line with some 1-2cm offset which is great.

So can someone explain to me why AOG shows 10 cm diference while driving and close to 0 diference when standing still on the line.

My socond question is how to set up IMU - GPS fusion slider. What does it do actualy?

Here is the video – https://youtube.com/shorts/sG02smhd_Nc

Thanks in advance. BR, Boris