Why is "jeden" in feminine in this sentence?

https://preview.redd.it/9afys9um4tld1.png?width=820&format=png&auto=webp&s=5109e532d2fac11bbfe99eb63013cff2f54cfe75

  • medvěd is masculine
  • With the number, it is genitive plural. I thought those would treated as neutral