Duplicate calendars with same name in my iCloud calendar

Dear experts. My iCloud calendar suddenly having these same name duplicate calendars (named as Home), shown in the first figure. And it synced throughout all my devices. And my Calendar apps on my Mac stuck and repetitively displays an error stated "Couldn't move your calendars to iCloud because an error occurred", as shown in 2nd figure. I appreciate if someone can help me solve this. Thank you!