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After I correct it I then re-created it a few times to really understand what is happening here.
I was confused because you need to plot 3 measures on one chart.
The key is to drag your second measure (Men) to the left hand Y-axis. This way you do not use up your 2nd (right hand) Y-axis which is required for the Gantt chart.
Secondly it was not intuitive for me to use a Gantt with one measure (Women) and then use the calculated field (Difference) on the Size mark to create a horizontal line. Now I know and I'm happy!