iOS page scroll changing when using year dropdown

Thank you very much for your hard work. This is my QA contribution, to which hopefully I would be able to provide a solution (in time).

The scroll position of the page changes after using the YEAR dropdown in the date picker. This is mostly noticeable on "date of birth" date inputs, when the user has to scroll a lot to find the year he was born. After the user has selected the year, month and day, the datepicker closes and the scroll position of the page is different from the position where the datepicker was triggered.

It's happening on iPhone 6 and is some iPhone 5.