Completed Showdown but says I Failed

[JakeLeeR_MLBTS]

I spent the last hour doing this showdown (and spent 500 stubs to enter it) but it popped up and said it was incomplete and was in turn a failure.

I don't expect things to be perfect at launch - but am I really expected to complete things and then not get credit for it? What happens if I finish it again and run into the same issue?

This is frustrating.