I didn't mean to put the sections in. I wonder if the section marker got copied when I copied bar 1 to bar 3.
Yes. That's catches me out from time to time, too. Section markers are usually copied.
While it's possible to use "Edit | Copy Special | Copy from... to..." and deactivate 'Bar Settings' to avoid copying section markers, I find it is often quicker just to copy everything, part markers included, and then just remove the part markers.
Glad you're up and running now!
Regards,
Noel