I have a service project that was entered for 01/09/2021 and it is showing up in 2020 and 2021 with the 01/09/2021 date on both. If I edit the date it changes for both. It is a little frustrating.
For what it’s worth, some of my events show up the same way.
I’m certain it’s the same event showing up in two different years for inexplicable reasons.