To reproduce this error, go to the Justice Initiative Central Community (https://karl.soros.org/communities/justice-initiative-administration/calendar/day.html) and click on June 20th. On this day there is 1 occurrence of the event "ZN-NY", displayed in the NCJR Central layer. However, if you go to the set-up screen you'll see that 3 layers in this community are set-up to display events from the Zaza's Calendar community (https://karl.soros.org/communities/zaza-s-calendar/calendar/day.html): NCJR Central, Admin Central, LCD Central. Given this configuration, it should mean that the event "ZN-NY" should appear 3 times on June 20th if you select the All Layers view. This is not happening - the event is only appearing in the NCJR layer. If you drill down individually to either the Admin Central or LCD Central layer, then you see the ZN-NY event. The problem is that if users are scanning quickly on the All Layers view and only looking for the colored layer they normally follow, then they won't realize there's an event they care about on that day.
I tried to explain this as clearly as I could, but let me know if you have questions. Thanks!
Balazs, can you do the first triage on this and make sure it isn't an issue in the JS or view code? If it's lower down, I can assign to Chris.