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The Elf's "Proficiency" bonus is showing as 1d6, so the Passive perception is only adding the bonus of +3 for his wisdom. It looks like that character has "Proficiency Dice" (DMG Optional rule) selected in the config menu (Ability Options) and the 'passive' doesn't add dice rolls. If the character used the standard proficiency progression he'd get +3 for his level and show a Passive Perception of 16.
I don't have the DMG so I can't look up what that section actually says for how that optional rule is meant to work.
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