I'm guessing one project required currency conversion and so the 11 cents is the cost of conversion for that one project. Maybe they gave the project $10 and 11 cents got eaten in conversion making it $9.89. It's possible they spent $155,000 but projects only got $154,999.89 so the note the latter.
If you spent $155K, that's how much you donated, regardless of the transfer fees.
But if you spent $154,999.89 because the exchange rate slightly improved while you preparing the transaction, after you chose a number of Euros to donate, then you spent $154,999.89
