com.icesoft.faces.component.selectinputdate.SelectInputDateRenderer#checkLink() checks whether the calendar button that was clicked is the same button that corresponds to the current SelectInputDate component. It does this by looking for the clientId of the SelectInputDate component as a substring of the linkId that was clicked. This approach produces a false positive if another selectInputDate component exists that has a client id which is a superstring of another selectInputDate component.

To reproduce, create two selectInputDates side by side. Give the first an id of "test", and the second an id of "test2". Click the calendar button of the "test2" component. The popup for both "test" and "test2" will appear.

This is because the client of "test" is a substring of the clicked link id, which is "test2_calendarButton". Therefore the test in com.icesoft.faces.component.selectinputdate.SelectInputDateRenderer#checkLink() returns true.