It happened to me for a while just after migrating to the new forums. Not sure what caused it, but I appeared to be triggering some kind of internal spam or content filter. At the time I was posting threads with more links than average which might have been part of the problem. If the forums keep auto-modding you, PM one of the moderators to have them take a look.
The system defaults to Approval from time to time. It's just a bug. Nothing to be alarmed about. That is, unless there's some reason why our comments are in need of it, but generally people know when they are being inappropriate. Lol.
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Doubt that's the case it's happening to me everywhere I post.
Hangin in Joe's Garage....