The kidlit program is really young, so my guess is that it is more that, or perhaps they don't have a great baseline for competitively assessing the candidates against those for more well-established programs. Plus, there are fewer faculty associated with it.
They made up the difference between a private scholarship I had and actual costs. I couldn't begin to guess what they base it on though. I have been in teaching several years, and seem to have a little different CV/ record than a lot of applicants, so it could have been atypical as well. Unfortunately, when my scholarship was canceled due to Covid, there wasn't any more funding big enough to get back to fully funded (I am unwilling to self-fund again :).
I did get the email about decisions coming after Dec. 7, so I don't think that was program specific!
And last year, rejections came out a week after the shortlisting emails, based on the old threads.