The regular Duo glitch...yeah, I was just learning French travel, and I put in the exact thing it was. I then submitted it, and Duolingo told me it was wrong. But the example it gave was the exact thing I put! It was in the "tap the words" learning strategy, if that helps. I don't know what it's called. If you get Duo+, will content work better? I don't see the point of spending dollars just for removing ads. Who cares if Duolingo is free? It's for learning. We need to learn CORRECTLY. #KatCanYouSeeThis
Can you post a screenshot? In my experience, there's often a small, but crucial error that the poster missed. Occasionally, however, these things happen, especially on the app, when the internet connection is sketchy.
You're not the first one to have this problem. I had a post a while ago about me having the same issue.
Don't ignore it, report it! Mention it in the forums, so a contributor/moderator can see. This helps things like this get fixed faster.