Enums are unusable in data tables for importing. They import solely as their default "zero" value (albeit with the name wrong - but that still "functions" fine).
Sample enum: Dog, Cat, Bird
Sample default names: NewEnumeration0, NewEnumeration1, NewEnumeration2
Sample list: Dog, Bird, Bird, Cat, Dog
Result: NewEnumeration0, NewEnumeration0, NewEnumeration0, NewEnumeration0, NewEnumeration0
...so the actual values have been lost on import. You essentially have to manually manipulate everything within the editor itself, so you cannot use external software to change the data.
Head over to the existing Questions & Answers thread and let us know what's up.