I am on step 3 of this quest, and I have collected a few foundables of this family and it doesn't seem to be adding up.
Is there a problem related to this?
I completed it earlier this week without an issue. Are you sure you're getting the Care of Magical Creatures foundable (the light blue ones) and not the Magizoology (dark blue ones)? I had problems with this at first too until I figured out I wasn't getting the right ones.
You are right! Sorry for this.