This is a problem with dualingo! I always Google a word if I am suspicious of the Dualingo pronunciation. When I Google άντρας, for instance, I realize the n is silent. Makes so much more sense as "adras," but the robot makes it sound like ondras. AFAIK the robot lady's pronunciation of strawberry has stumped even the most resolute Greek academics. And haburger for hamburger, an English word.
I'm a total beginner though. Maybe it makes sense to other people. I also love and appreciate dualingo. And chickens.