Why does the date picker show differently on PC and phone

Hello guys, I am a beginner in Qualtrics. There is a question in my survey asking people to choose their evacuation date from 6 days. This question works perfectly on computer, but when I use the phone, the default date is today. I don't know how to fix it.

Here is the preview on computer.
Here is the preview on the phone.
But when I use a real phone, it becomes this.
Respondent has to slide the date from today to October, 2019.

Here is what I put in the header.
Here is my Javascript.