In case of Ara chart, once you add more than 1 layer of dimensions in the chart, Tableau automatically add partition between dimensions,
There are no way to eliminate this basic feature.
If you keep the discrete dimension only one or keep axis as continuous, there are no partitions.
We can provide some workaround in your case if you could attach your data as twbx format.
You got (at least) 3 date fields on the Columns shelf, so as Shin said is "breaking" (partitioning) on the Quarter.
Remove the other date fields (leave Month there) and it should work.
Thanks guys ... I see what you both are saying. (Chris I removed everything except month and that solved it but caused another problem). I'm going to take a slice of the DB and upload it.