Because you have entered part markers on bar 3, 7 and 11.

Click on the blue marker on bar 3. Blue means you entered a part marker with the A substyle. When you click on it, it will turn green (B substyle) then click again and it will clear. Leave it clear, and bars 3 and 4 will move to the same line as 1 and 2. Etc.

A common cause of what you have is copying the first two bars. It copies the part marker as well.


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