Yep, the comma splices irritate me, too. You can't just paste two complete sentences together with a comma; instead, you should use a semicolon!
Like so many of these examples, this us two separate sentences. I often find the punctuation the most confusing aspect of these questions.
The punctuation doesn't matter, Duolingo ignores capital letters, commas and periods.
I think the issue may be that in English this would be considered a run-on sentence (or run-on question,) which adds an unnecessary layer of confusion.