Date Picker jumps if the control is at the bottom of the Page

[finoshj]

If you have a datepicker control as the bottom of a page, it starts jumping when you click the box more than once. Please find the attached link. Any help would be appreciated.
https://www.loom.com/share/01e22033127f4550aa1d2b072b3622a0
Cheers
Finosh