Posts from a closed group showing up in site's activity feed

[Firefly 35]

I just posted a topic in the ABDL meetups group that I run and found that it showed up when I clicked on the "All Activity" tab.  I thought content from closed groups was not supposed to show up there?  I want to ensure that people have a place to post events without the whole world knowing.

[DailyDi]

It's not on my All Activity tab, so it must be user-based and only shows what you have rights to view.

[Firefly 35]

I tried logging out and didn't see the post listed so I suppose it was just me.  Thanks.