Try changing your Y-axis modeling type to Continuous (currently you have Nominal). You can change it directly from graph builder by right-clicking on the bars on column selection or you could change them from data table by right clicking on column header.
![jthi_0-1689009195491.png jthi_0-1689009195491.png](https://community.jmp.com/t5/image/serverpage/image-id/54544iB9C0D5E0D02B6DCE/image-size/medium?v=v2&px=400)
Nominal:
![jthi_1-1689009240108.png jthi_1-1689009240108.png](https://community.jmp.com/t5/image/serverpage/image-id/54545i6609B37DC24F2787/image-size/medium?v=v2&px=400)
Continuous:
![jthi_2-1689009248324.png jthi_2-1689009248324.png](https://community.jmp.com/t5/image/serverpage/image-id/54546iC80C5DA82694CBC5/image-size/medium?v=v2&px=400)
-Jarmo