At the end of this mission, if the Imperial player wins, he gets a total of 3 XP

Is this correct or "Imperial Player receives 1XP" was printed twice by mistake?

Usually he wins only 2 CP for a win...

Usually, win or lose, the rebels get 1xp and credits for crates, and the imperial player gets 1xp and 1 influence.

As an additional bonus, the winning side usually get bonus credits (influence for imperials), a reward card, or an ally (villain).

This may be a misprint. You should submit a rules query using my link below.

Done. I'll tell you if I get an answer.

(It's almost certainly an editing mistake.)

You're right, here is Paul Winchester's answer :

The extra line granting the Imperial Player 1 XP is a misprint and will be corrected in the next errata.

Ah, thanks. I'm playing this tomorrow and was planning to assume it to be a misprint. Good to have the official confirmation.