Calendar events update fail if I don't open Google Calendar.

I am using third party calendar (business calendar 2) with Google calendar sync (Google calendar installed).

I find the following

1) Input new events in third party calendar (business calendar)

- events shown correctly in third party calendar

- events shown correctly in the widget of Google calendar

- events shown correctly in chrome (web view of Google calendar)

- events shown correctly in klwp editor

- events not update in klwp (updated in editor)

*** everything goes fine after I open the app "Google Calendar"

2) Input events in Google calendar

- Events shown correctly in everywhere.....

could you help me?

thank you so much