I have 2 instances of KoolCalendar on a page.
The second one is open:

When I click the first one, it is obscured by the second one instead of closing the second one:

Seems to be a bug. Please provide a fix.

Please use different name for each Calendar:

$date_one = new KoolDatePicker("date_one");
...
$date_two = new KoolDatePicker("date_two");

Please let us know if you need further assistance.
Regards,
Peter

You can use the offset parameters to have your calendar load in different positions.
OffsetLeft Get or set offset left of panel containing calendar and timeview.
http://doc.koolphp.net/Controls/KoolCalendar/PHP/KoolDatePicker_Class/index.php#OffsetLeft
OffsetTop Get or set offset top of panel containing calendar and timeview.
http://doc.koolphp.net/Controls/KoolCalendar/PHP/KoolDatePicker_Class/index.php#OffsetTop

I am using different names, but this does not fix the problem.

Using different positions is a workaround, but not a fix.

You could use the client events to just close the calendar that isn't suppose to be open.
http://doc.koolphp.net/Controls/KoolCalendar/Javascript/KoolCalendar_ClientEvents/index.php