diameter is an alternative for circumference which is a measurement of the trunk at 1.3 meters up from the ground. It's also in meters if no unit is given. Can you review these two trees to fix the values. See https://wiki.openstreetmap.org/wiki/Tag:natural%3Dtree for tagging trees.
            ---
            
            Published using OSMCha: https://osmcha.org/changesets/165386570
            