Wtf, @SlackHQ sometimes sends desktop notifications about *my own messages*, that I sent *days ago*.
Seems to happen shortly after I open the channel, then change to a different tab. Not necessarily most recent message, either. In this case was one that the other person had 
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Oh dear, that doesn't sound ideal. Could you please write to us at feedback@slack.com with a link to this thread? We'd love to take a closer look at this. 
