I've put some work into a multi-lane graph and now need to add an additional lane. In a new blank swimlane graph (using yED swimlane template Horizontal Swimlanes) this is simple, right-click and then add row. In the graph I'm working with, when I try to add a new row it gets superimposed on top of the top lane in the diagram. The first screenshot below is before adding the new lane, the second is after, where you can see that the left-hand lane title is jumbled by the new lane on top of it.
I'm clueless and really need help with this, please. The original file is available at https://drive.google.com/open?id=1Bt70h8U7LyVbZj96UZrX6zfol-DsnjaF.