Im on android and the audio file sounds very strange. It sounds like "εμείς δουλευΜΟΥμε"
you're right!sound glitch.
Unfortunately the Greek team is not responsible and cannot correct relevant problems,however,you are requested to raise this issue here https://support.duolingo.com/hc/en-us. Thank you very much for pointing it out!
I heard that too, thought I wrote it down wrong. (Yes, I take handwritten notes on paper.) I reported it directly from the question page.