UPDATE:Did a little test, maybe this will help narrow things down.Copy Map X Y Coordinates to clipboardVancouver My MapX: -53780981.811385006 Y: 6318025.736052506Vancouver Coordinate Menu WidgetX: -13707478.753861206 Y: 6320901.449768862Vancouver: MyMap with Operational Layer Projected in WGS 1984 Web MercatorX: -53781471.008366026 Y: 6318514.933033532Map Service is not public but I think you looking for this information. I noticed that the Spatial Reference is 3857 and not 102101 or 4326, issue?VWeb (MapServer)
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Copyright Text:
Spatial Reference: 3857
Single Fused Map Cache: false
Intial Extent:
    XMin: -13458714.8258235
    YMin: 7595516.94052755
    XMax: -13431961.8659237
    YMax: 7606370.99854403
    Spatial Reference: 3857
Full Extent:
    XMin: -18305842.9979
    YMin: 5552185.1391
    XMax: 840681.6802
    YMax: 14793217.5532
    Spatial Reference: 3857
Units: esriMeters
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