Tell me, maybe these are two different datePicker?
https://snippet.dhtmlx.com/ld4le0bj
Thank you for your report. This is a known problem. It will be fixed in the next dhx.Suite update.
We have fixed your reported problem in the dhx.Suite 7.3 update.
Now several calendars should work correctly in the toolbar.
You can test it here: https://snippet.dhtmlx.com/7lohwtr3
Please, try to download the latest available dhx.Suite build to get that fix