The automated audio is kinda bad at this one. Google Translate is doing a little better job: https://translate.google.com/#sv/en/jag%20%C3%A4r%20en%20flicka In normal speech, it's pronounced /'jɑː eː/ and that might throw you off, since it's two vowels after each other and thus forming a diphthong.
Yea, I checked the comments just to ask what is going on with the audio. I didn't know it was automated... I do not think it should be there then, if it pronounces the words badly. I thought I can trust the audio on Duolingo :( I did with other languages, which pronun. of words here I could not verify, while with Swedish I grasped some of it while being in Scandinavia.
Both mean "a" or "an", but "en" corresponds to the Common gender while "ett" corresponds to the Neuter gender.
Let's compare to German:
Der/Ein Mann - Masculine
Die/Eine Frau - Feminine
Das/Ein Kind - Neuter
(En) Mann(en) - Common
(En) Kvinna(n) - Common
(Ett) Barn(et) - Neuter
Why does the word "Är" sound like the letter r in the audio, but other words with an umlaut A, like "Äter", or "Äpple" sound more like eh. Am I supposed to pronounce "Är" more like "air"?