There is a possible problem in the code of the datepicker.php file (at least in my case). The newly chosen date wasn't advancing or being recognized.
The original code Line 8 of the-events-calendar/views/datepicker.phpwas causing an issue:
$link .= '&eventDisplay=month&eventDate=';
However changing & to a ? to begin the parameters (as is used throughout the Plugin and other conventions in WordPress) resulted in a fix:
$link .= '?eventDisplay=month&eventDate=';