Foreign earned income exclusion

I have a foreign earned income of $30,000 from salary in Foreign country. I meet the Physical presence test and Turbo tax says I qualify for the Foreign Income earned exclusion. However after putting the foreign earned income amount my tax liability has increased by $3000.. I do not know the reason as ideally the entire amount should have been excluded and my tax liability should have remained intact as my income is less than $100,000?