Here are three suggestions:
1. rename the field from "MTD Count along Table (Down)" to "MTD Count"
2. create a calculated field with a formula of just: "MTD Count"
In Tableau 9.0 Edit Alias option is not available. I am sure there is better solution in 9.0 but don't know where and how its available.
That's odd. The edit alias option is available in my version of 9.0 as well as 8.3 which is the first version of Tableau I've used. I'm on 9.2 and the option is still available.