A couple things to check:
1) Make sure that all the flying lines and bridle lines are clear and go straight to the kite. Make sure that one or more of the lines are not
twisted or wrapped around a knot or any of the other lines. The bridle lines should go straight and clear from the attachment points to the sail and
not hang up on anything. Flying lines need to be straight and not wrapped around each other. None of the lines should be wrapped around the bar or
knots or anything.
2) Make sure that all the flying lines are equal in length. Lay the kite out on the ground with the lines fully extended. Drive a screwdriver or
something else solid into the ground between the bridle lines of the kite and then loop each of the flying line loops (sleeving material at the very
end of each flying line) around the screwdriver so they are all attached at the exact same point. Usually it is best to disconnect them from the
bridle of the kite and attach them to the screwdriver (or kite stake) and then stick it firmly into the ground. Then go to the bar end of the kite
and disconnect each line from the bar at the sleeving. Then pull all four lines so they have the same tension on them. All four lines should stretch
out to the exact same length of each other (or within 1/4" or so). If one of them is more than an inch longer than the others then that line will
need to be equalized to match. One longer line will cause the kite to constantly drift to one side.
If that doesn't do it. Check the bridle lines and see if one side has stretched out more than the other. You can do this by collapsing the kite in
the center so that you can line up each leg of the bridle with the same leg on the other side of the kite. Stretch them out fully and see if they are
the same length.
Try those things and let us know what you find.
Hope that helps!
Oh...and congrats on the kite! The Scout is a fun one to fly.