on iOS 10 Safari, choosing the month or year via dropdown brings up the selector when you click on a radio button

Steps:

1) Navigate to https://jsfiddle.net/umspk4z3/2/ on an iOS 10 device or simulator, in Safari

2) Choose a date via the dropdowns, e.g. September, 1977, 15

3) Click on a radio button

Actual:

The year selector comes back up, and choosing it does nothing. User is unable to click the radio button as year selector always comes up.

Expected:

User should be able to select the radio button. Year selector should not come up after focus shifts away from calendar.