Labelled graphic markers are displaying in the wrong order


I have a labelled graphic which had 3 markers, numbered 1-3. I then added two more and edited the numbering so that my new markers would appear in the correct order, so in the order 1a, 2(1), 3(2), 4(3) 5a, where "a" shows the new markers and brackets shows the original markers' position. 

Now when I preview the lesson and use the arrows on the text to skip to the next marker, the markers are displaying in the order 1, 3, 4, 5, 2.

The markers themselves are numbered correctly, sothe skip to next function isn't behaving the way I was expecting. Is this how it works or can I edit the display order?

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