Hi Mahir256,
Thank you for confirming what I have long suspected myself, that I was unnecessarily adding duplicate data points, via two statements containing equivalent values.
The motivating factor was that the Commons infobox template does not calculate and display converted units of imperial to metric, and vice versa; however, most (or all) of the infobox templates for the fr wiki automatically convert imperial units to the metric system, and if equivalent imperial and metric unit values are added to Wikidata like I had been doing, duplicate values are displayed in the those aforementioned infoboxes.
Recently, I have begun to add only a single value for elevation to items from GeoNames (Q830106) (metric unit), opposed to adding the two equivalent values from Geographic Names Information System (Q136736), which receive no updates. Going forward, I will only add a single value from a source that may have equivalent one(s), and I will remove the duplicate ones that I previously added to items.
Thank you!
Dcflyer