Hello.
At your page us showing the calendar not from the original “Booking Calendar” plugin but from some other with similar name.
Please check how is looking original Booking Calendar plugin at screenshots at this page: http://wpbookingcalendar.com/screenshots/
Also you can test Booking Calendar live demos at this page http://wpbookingcalendar.com/demo/ to be sure in functionality and do not have misunderstanding.
You can download and install Booking Calendar Free version from here https://ww.wp.xz.cn/plugins/booking/
Relative to that plugin, please contact support of plugin who was developed that plugin.
Kind Regards.
