Datepicker doesn't show Change Year

Hello,

I really like this plugin. But since a while the changing year option is disappeared.

Any Idea how to fix it?

This is the code for the form:

<p>Uw geboortedatum (verplicht)
[date* geboortedatum date-format:mm/dd/yy year-range:1920-2010 change-month change-year] </p>

Check http://www.fitnesswayoflife.nl/online-inschrijven/ to see an example. Click into the field below ‘Uw geboortedatum’.

Thank you!

https://ww.wp.xz.cn/plugins/contact-form-7-datepicker/