To paraphrase a moderator from the Czech course: You have to tell us the complete sentence you wrote, or otherwise, no-one can help you. And if you think that you should have been accepted because you typed in exactly what was expected of you on behalf of Duo, hit the flag button in the lower right corner (on the red screen that pops up when you log in your answer) and report that your answer should have been accepted. But if you don't tell us your exact answer, no-one can tell what you did wrong or if it was a bug.
You probably need an English course to know English better but I hope that you would like to help people here in the comments to learn Swedish. The comment section lacks of answers and it's sad. I don't know why people are not interested in learning Swedish and so few people want to help each other here
It sounds like the bread is eating the bread. Because "'bröd'erna äter 'bröd'" use the same 4 letters.
Instead of English you usually say "The 'brother's are eating 'bread'", so you see the difference between bread and brother in English. And yes I know the swedish singular word is just bror and broden is the brother.