Why do threads change to Awaiting Approval?

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Posted something in the Omega Vintage watch discussions. I made a small edit to update a simple typo. The thread became hidden and changed to "Awaiting Approval". Still been that way for almost half a day. What triggers that?
 
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Yeah, it's just overzealous anti-spam measures that can sometime bump it to the manual queue. For sales threads we approve every post manually too.