Wrong Route

Hi everyone, I got my parent child visa. I'm currently in the UK and to the best of my knowledge, I meet the eligibility for the 5years route but I was given the 10-year route. Can anyone who has experienced this or have knowledge of this help me to rectify the issue and get a 5-year route instead.

My salary is 24,500 I have a UK university degree and I am the primary carer of my child.
My six months payslip has one month on maternity pay. Which i explained in the cover letter that the pay is smp. I attached letter from my employer.

I am totally confused why I was given the 10year route. Any help to change to the 5 year route would be greatly appreciated

Thank you