Are you sure about the historic=monument? monument is described as "A memorial object, which is especially large (one can go inside, walk on or through it) or very tall". And node 1840038725 definitely does not comply with that.

I believe historic=memorial is better suited for this one. With memorial described as "Small memorials, usually remembering special persons, people who lost their lives in the wars, past events or missing places"

See also https://wiki.openstreetmap.org/wiki/Tag:historic%3Dmonument#Warnings