Then I’m guessing the packs may be treated as temporarily free at a set month. Maybe someone didn’t fill out a database column boolean marking them as permanent. I can only guess from my experience with databases.
I’m guessing uploading it to a cloud server and distributing it to your students is probably against TOS.
People just have to wait for them to fix the bug. Hopefully they will get enough feedback to merit a database check. Wish I could help more but I’m just a fellow user.