Oh I see. It's because in the profile of James Waller (1788 - 1851), if you go to 'Edit' mode, you'll see that his father John Waller is not indicated with 'father is Confirmed by DNA'.
I wouldn't recommend you change this without a proper DNA confirmation and citation that Wikitree requires. It's a somewhat complicated topic, you can learn more here:
https://www.wikitree.com/wiki/Help:DNA_Confirmation
Indeed, I see you have a number of parental relationships in your tree that are marked Confirmed with DNA that are missing citations that I would recommend you revisit and perhaps choose a different level for the parental relationship (in each case on the child's edit page).