u/DepartmentDecent3507

I'm new to Anki and just starting my MCAT prep. I tried using the jacksparrow deck to review Biology Chapter 2, but was surprised to see the first few cards asking me about Jean Piaget, schema, and stages of development. Is it common to have cards accidentally put in chapters/subjects they aren't supposed to be in?? Or did I download the deck wrong? Any advice is appreciated, thank you!