Hello. My name is Michael. I have to report a bug on IPhone, but I'm not sure if it also is on other devices. When I double-tap the speaker on "Repeat what he/she said" it says you are correct. If that is the same for other users, please say so below.
The speaking exercises are very unreliable. They sometimes say I am correct even when I speak garbage, and at times they say I am wrong even when I speak the words correctly.
I have stopped doing them due to this but I still speak them out loud for the practice.
I have come across this issue as well. Not very often, fortunately. Sometimes it tells me my answer is wrong even when I said it perfectly. It seems like the audio input thingie cannot hear me. On the other hand, it often tells me i'm correct even when I haven't finished the sentence yet! Once it got stuck completely and I had to reload the duolingo page and start over.