DateRangePicker skipping month on start : previous date

hello,

I am trying to use the date range picker to pre-select 15 days ago to today,

however when I display 2 calendars, it looks like the month is skipped.

and even if i change the month with the controller up on the top, it still shows in range of two month.

snippet here

https://snippet.webix.com/kl4yaokc

anyway to fix this?

Looks like this issue was fixed going to 6.1 version.
https://snippet.webix.com/70semr7k