Ab line issues I think

So today when I went down an ab line, and applied area was to the left, I was matching up and everything was fine

When apllied area was to the right, agopen was following the line in the program just 1-4cm from the line, yet it was showing a gap on screen (painted area) and in the field work of 20-30cm.

Tried shifting antenna postion in agopengps and all sorts.

Am I missing something simple, or do I need to recreate field etc.

Can you drive over the same line in both directions?

Thanks for the reply Richard… To update I went back to the field started agopen, and everything worked fine, maybe I had messed around with the settings too much, and just a restart was all that was needed.