It appears to have been fixed (that marker has been removed). Two FHC's are 7 miles from Arlington: Annandale or McLean FHC in Falls Church:
When I search for a Family History Center location for Arlington, Virginia, information about a Coal City, Illinois FHC appears instead.
To illustrate @WandaSnowFranklin's post,
@P Jeffrey was able to help us get a few of those incorrect locations fixed earlier this year. Perhaps he can be of assistance again.
I am sorry I can no longer make corrections ( I retired) and I am not sure who can.
Maybe a Mod could help move this issue along?
Thanks so much for removing the incorrect FHC link.