Event Tooltip In Wrong Position

Hii

I add Google Calendar in page. Here problem is that when i hover from event then Event Tooltip is on one week above day, Like their is one event in 28th and i hover for Event description but Hover bobble displays from 21th. Here is link for better understanding : Link

Please help me resolve this ASAP

Thank You

https://ww.wp.xz.cn/plugins/google-calendar-events/