Hi Ian,
It's difficult to say for sure why you would be experiencing this issue, but one thing you can try is to place a line (or any element) using the desired centerline Line Style directly in the Model, then re-extract. Does that change the results?
It's difficult to say for sure why you would be experiencing this issue, but one thing you can try is to place a line (or any element) using the desired centerline Line Style directly in the Model, then re-extract. Does that change the results?