I am using kylo 0.9.1.1
In Step 4 of "Advanced Data Ingestion Template", we can choose Domain Type.
For example, I defined one domain type with field name = "first_name".
I am using userdata1.csv which is Kylo's example csv data.
Then, In Step4 of "Advanced Data Ingestion Template",
I select this domain type for "last_name".
Then, UI replaced "last_name" to "first_name" as Field name.
So, I get two "first_name" fields in Step4.
You can see what I mean in the attached screenshots.
If I go back to the previous step (i.e. Step3), I can change "first_name" to "last_name" to fix this issue.