I looked around at some of your other posts. It looks like because you didn't have a signature, they were default to being off. If you go into the advanced settings for your post you can edit to turn your signature on or off. The same option is below on the quick reply. I don't know why the forum read you not having a signature as having it disabled as default in your posts until now. But that would be the reason you can't see your signature in any other posts.
It looks like now that you have one, it is enabled to being on by default. Unless you checked the box when you were posting. So all future posts will have your signature, but if you want older posts to have it you'll have to manually change it.
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