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Attached picture 2. These accounts all have a long name. 222222222.png

@robert I think you should ask this question to Ultimate members plugin support. These avatars come from UM plugin. So UM plugin affects forum us...

@robert Thank you, I just gave a 5-star review on the plugin page. Dashboard > Forums > Dashboard and click the [Delete all cache] button. ...

@robert Thanks so much for your reply! I seem to understand some of the logic. But when I took over this forum two months ago, I did not see anything...