Date input swaping date and month around in E-mail Autoreply Date fields

If i insert or pick date in fields Start Date and End Date in E-mail auto reply, this happens:

(then I click to next field)

and you can see that day and month in first field will swap, same thing is happening every time I (mouse) click away/to another field or button so it's basically impossible to enter any date. For example 2017-28-07 19:00 (YYYY-DD-MM) will became 2017-07-04 19:00 which is i assume swapped month with date (07->07) and day will became month (28->04 - which is I assume (28-(12+12))?). And if I click on it and away again it will go to 2017-04-07 19:00

I tried to use TAB for moving between fields - which doesn't help either unless I remove two datetimepicker divs from source code then by using only TAB I'm able to jump between fields and to save button without this problem happening but in whole process I cant click my mouse anywhere else in the browser window or it will swap the date and ruin it.

I tried this in Chrome, Opera and Edge and in every one of them It's same story...

Edit: ISPConfig 3.1.6