No I didn't understand the question.
You are not using CSSUtils in your code, any other styles already set in txtTeamNameHome.Style will be lost with your code.
Having said that, just as a test, this code:
TextField1.Style = "-fx-text-fill: Red;"
gives me this result:
CSSUtils.SetStyleProperty(TextField1,"-fx-text-fill","Red")
Gives me the same result.
Have you changed anything else for that field either with inline css, the designer or in a style sheet?