I'm going through the "la nakamura teorio" course and I'm on section 23 exercise 10 the last exercise of the sector and I'm basically stuck. The exercise wants me to rearrange the sentences into the right order yet it always gets marked as wrong no matter what I do to try change my answer it still gets marked wrong. I don't understand because it's not likely that I could remove the sentence from the list of sentences. So if anyone here has completed course could you like help me out please.

Hey man, how are you?
At this point, you've probably solved the issue, but anyway, I've just finished the lesson, and no problems here.
Arrange the sentences, then click on "check" and the page will highlight any sentences that are wrong in red. Then just click on "try again" and rearrange them in the right order.