Best thing to do is report it to Duolingo as a bug here:https://support.duolingo.com/hc/en-us/requests/new. I'll report it as well. Hopefully this will get fixed.
الربيع بارد - add the definite article to "spring". If you add the article ال to both it becomes "the cold spring" الربيع البارد
seems like writing a comment in both languages messes up how it displays... hopefully you get the idea