Lesson practice just had a brainfart.
I was doing a lesson practice in German when it suddenly decided I had 22977910 minutes on the clock and needed to practice every permutation of "gemiendsam sind wir stark" (together we are strong) that it had on it's books.
FYI : Here (in the general discussion section, called Duolingo or General) your post will be quickly lost in the enormous amount of posts so, to have more answers/explanations to your feedback (or in your case to be sure that Duolingo's team will see it), it would have been better to post it in the Troubleshooting Discussion.
When you create a new discussion, there is a drop-down menu on the top, change from the default value "Duolingo" (which corresponds to this general discussion page) for the specific one (Troubleshooting, in your case). But you can change it now, it's not too late : edit your original post then select the Troubleshooting forum.