Notice that all three of your signatures in this thread are the same. In fact, every post you have ever made, will have exactly the same signature. That is because signatures are not stored with the posts, rather they are stored in the member's account. When a change is made, the change is recorded in the account. When a post is displayed that should have a signature, the signature is copied from the account.
You can also see your signature by viewing your profile.
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