We're glad to share that this issue has been fixed! If you're still seeing any lingering issues with spacing in Slack, a refresh (Ctrl/Cmd + R) will clear this up. Sorry for the trouble.
7:20 AM PST
We're looking into some display issues across Slack that users may be experiencing. Sorry for the eyesore, but a refresh (Ctrl/Cmd + R) should clear things up for you.
7:11 AM PST