Word-order is (for some reason) restricted: "Tibi placet caseus" didn't work.
(But, after all, it's the endings that matter, in an inflected language!)
Just report. There is no reason, it's only that you have to report the word orders that are correct and not accepted. I mean, you have to report them with the button "report", not here.
See here: https://forum.duolingo.com/comment/33853120
Thank you, I've done both.
Reporting here doesn't work: just to inform you. Here it's the discussion between users, the report button is the report.
Yes, I do understand. When I post here, I'm not intending to report anything, but to start or join a discussion with people who may be interested in whatever question is raised. (Those not interested need not bother to discuss it.)
That is the understatement of the century