After a quick Google search:
Renders a field that represents a set of one or more users or groups on a form page (not a list view page) by using a PeopleEditor child control.
I have no idea what that means. Either way, I'm pretty sure that this is caused by one or more userscripts you have installed, since I've never seen that.
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Sometimes I see Userfield next to a game. What does that mean?
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