Problem with single value columns

I have 4 single value columns in a sheet. I am using them to read text literal strings from my “Master Options” sheet. Each of them get their value from 4 different columns and first row. I see the values fine in the data explorer. But I only see one column in the dropdown in UI builder. See attached.
Data explorer:

UI builder

What happens if you refresh the browser?

Could you share your app, please, and tell me where to find the columns and which dropdown you’re looking at?

@Jeff_Hager, nothing changes on browser refresh.
@Mark, please see screenshots which have more details.

UI Builder

Data explorer

Could you please share your app?

@Mark, I am unable to share my App on the forum at present. How would I share it with you privately?

You can PM me or email me at