[[Wayfinder?startId=`0` &excludeDocs=`1,2,3,4,5,6,7` &level=`2` &outerTpl=`mnews.OuterTpl` &innerTpl=`mnews.InnerTpl` &rowTpl=`mnews.RowTpl` &innerRowTpl=`mh.InnerRowTpl` &parentRowTpl=`mnews.ParentRowTpl` &firstClass=`first` &hereClass=`current` &selfClass=`here` &rowIdPrefix=`tm` &sortBy=`menuindex` &sortOrder=`asc` ]]
See the startId=`0` parameter? (it should be &startId=`0` actually, you should change that) That's telling Wayfinder to start with top level resources. When you created a duplicate top level resource, but didn't exclude it from the Wayfinder call it got included. Rather simple actually. If you'd shoved that resource into any other container document, it wouldn't show. (&level)
I'm also a tad confused about the tags, as this is clearly an Evolution MODX installation, yet the Wayfinder bits are using Revolution brackets. While it seems to work... you may want to change that to Evo brackets (single brackets). Actually, the Ditto bits are using Revo brackets too.
[Wayfinder? &startId=`0`] <--- Evolution
[[Wayfinder? &startId=`0`]] <--- Revolution