Foreign earned income exclusion not applied correctly

Hello,

 

my wive worked in the netherlands for more than 380 days and did not return to the US in between. She also payed taxes in the netherlands and there is a tax treaty in place. After filling out section

"Foreign Earned Income and Exclusion" Turbo tax confirms that she is subject to the foreign earned income exclusion. Her income is below 15000 dollar.
 
However, when I add her income in this section this increases the taxes we owe by roughly 2800 dollar. This seems a bug in Turbo tax to me as due to the foreign earned income exclusion no tax should be owed on this income as she already payed taxes in the Netherlands.
 
What am I missing?
 
Thanks a lot for your help!