This is not an easier problem?
"To nie jest łatwiejszy problem"
And the meaning is pretty much identical. Why force the very specific word order?
Those sentences have completely different grammatical subjects, which is one of the basic no-nos in this course.
See part 6 here: https://forum.duolingo.com/comment/28029344
Agreed, sentence structure indeed changes between the two. Thanks for the link - I will check it out.