Moldovan Wikipedia was deleted in 2010 (see proposal and T169450), but WDQS still knows the triple <https://mo.wikipedia.org/> wikibase:wikiGroup "wikipedia". This should probably be removed.
(Note that the <https://mo.wikipedia.org/> IRI also exists in two other triples, as the official website of Q3568049. This is unrelated and doesn’t need to be changed.)