You need to explain why you think this is erroneous. Your statement that Euros should behave like other currencies is meaningless without background on the circumstances.
I have no idea, since you provided no information, what you foreign currency transactions were. But I find it exceedingly strange that in every instance your closing balance is opposite your opening balance in sign and of exactly the same magnitude.
Unlike the other three currencies, Euros began with a positive balance and ended with a negative balance. So if the other three produced losses, you should expect Euros to show a gain.
Your statement about movement of exchange rates as being USD/EUR is incorrect. The rates shown, in your case, are EUR/USD. That is important, because it turns everything upside down.