Custom Column returns a Function?

[donkey shrek]

I am confused why my Custom Column returns a Function instead of lists?

Output:

= Table.AddColumn(#"Grouped Rows", "Test", each if List.FindText(Text.Split([All Matches], ","), [Email Domain]) <> false then each let EmailDomainVar = [Email Domain] in List.Select(Text.Split([All Matches], ","), each _ = EmailDomainVar) else "H")

I have also tried assigning the list parameter in List.Select to a variable first but the output is the same