The audio sounds natural if you ask me (moderators always use the web version, since the app makes it impossible to moderate anything at all). Not sure if there's a web-app difference, but that's usually not the case. But all languages merge words together, so I guess it takes some getting used to.
I think you might be confused about how the verb: "to like" is expressed in Greek.
There is a good explanation here by spdl79. And you can also learn about this construction in the Tips & notes for Present 1 which explains the way this verb is constructed.
See here for some other help in using Duolingo
TIPS TO HELP YOU LEARN + HOW TO REPORT A PROBLEM https://forum.duolingo.com/comment/22424028