My avatar assigned to a user after moving comment

Hi, I just moved an unregistered user’s comment to a different post. The user didn’t have an avatar before I moved the comment (just a “mystery person” image assigned by wordpress). However, after moving the comment, my avatar appeared with the comment as if I were that user! I have had to turn off the avatar display as it looks as if I am leaving comments under a different name on my own posts! How can I remove my avatar from the user’s comment? Help please!

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