Why don't the completion requirements in Daily Challenges agree with the requirements wording?

Bottom requirement says Complete "A LEVEL" of Walk Off Hero but the progress bar shows 0/5 indicating you need to complete 5 levels, not a (or ONE) level.  This has happened before, preventing me (and I'm sure many others) from completing the daily challenges and getting the challenge reward.  Perhaps a matter of semantics but where I come from "A" means ONE, not FIVE.
Thanks.
Keith Boyles "Keiffy"
Owner, Fenway4Ever (BigBallerz club)