The widget is placed based on the top highlight (see eg ve.ui.SidebarEditCheckDialog.prototype.onPosition) which could be much earlier in the document than the duplicate.

Possible solutions:

• Don't highlight duplicates.
• Don't highlight duplicates, but show an edit check for the first instance without a "fix" button, and add "go to next"?
• Change positioning for all checks
• Override positioning for this check