Q: You haven't answered my note/comment.
A: I haven't been on the account. I only use this account when submitting new stamps.
Q: I've seen some of these stamps before, but not on this account.
A: Yes, I made them on my other account, Sonira (https://www.deviantart.com/sonira). No worries.
Q: Well, I saw them on an account that's not Sonira (https://www.deviantart.com/sonira).
A: Then they were stolen from me. While the stamps in question may no longer visible in Sonira (https://www.deviantart.com/sonira)'s gallery, they are in storage.