I just wanted to point out an instance where "there" was used instead of "their" as an error in diction:
Forming the informal imperative form in Turkish is extremely simple. All you have to do is use the root form of the verb. More information about the formal imperative can be found in the skill “to be.” Here are the two verb in this lesson in there dictionary (infinitive) and informal imperative forms:
I'm glad to be able to begin to learn Turkish though Duolingo! How exciting!
You can probably change the subject to give an indication this is related to the Turkish course. Normally, it is a good idea to such issues directly on the profile of one of the active course contributors. But, I guess with the course released just a couple days back, they may have their hands full with user reports.