Thanks so much for your help with this. It seemed that the XML was corrupted. I created a new instrument track and pasted the notation which seemed to fix it.
So I have a chart ready to publish and I have an issue I have never seen before.
A handful of Open E notes are appearing bugged out in the far right of the chart rather than on the highway.
There are many Open E notes but not all are affected. I have tried deleting the notes and adding them again but this didn't help.
Has anyone seen this?