System details:
OSX 10.11.6 (15G1212)
Calendar Version 8.0 (2092.3)

I have a few Calendar subscriptions shared between my Mac and iPhone, including a few shared with multiple people. I noticed that on my Mac, when I open Calendar, there are 'exclamation point in a triangle' icons next to two of my groups of calendars.

What are these icons indicating?

Calendar Screenshot with Icons



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