Anyway, let's not get distracted here.
I just exported one of my calendars (zTodo) as an ics file and I'm having the following issues:
There are events in the file that do not show up in the calendar when I view it on your web site. For example, NOTHING from 2018 and before shows up. It's as if I didn't do anything those years. However, those events ARE in the ics file I exported.
There are events in the file that I moved to another calendar a long time ago. They SHOULD NOT be in this ics file. When I look at these events on the web site they appear correctly, in the other calendar and not in my zToDo calendar.
I am extremely anxious about these (and other issues) because they could mean that I cannot rely on the calendar. These and so many other issues are SERIOUSLY ERODING YOUR CREDIBILITY AS A COMPANY. DO SOMETHING!