In case anyone is interested in what Pinterest had to say about all of their blocks the other day, I emailed them and this is the response they gave me:
"Thanks for reaching out and sorry for the inconvenience. It looks like the test questions you answered incorrectly were not 100% objective. Because of this, we're removing them from our test questions. So while this impacted you on this one job, the good news is it doesn't affect any future work you may do with us or your mTurk quality score.
Thanks so much for working on our HITs and sorry again for the inconvenience!
The Pin Quality Team"