Well l don’t know why this happening in your situation but I can let you know something EnumNetworkDrives which will help you know more about this method. It will returns the list of Collection object which are the set of all the local and remote names of mapped network drives. Well all the even indexed elements are referred as local names and odd indexed names are considered as remote name. You can use the following VBScript code to enlist all the mapped network drive on the network of yours.
Code:
Set WshNetwork = WScript.CreateObject("WScript.Network")
Set clDrives = WshNetwork.EnumNetworkDrives
For i = 0 to clDrives.Count -1
WScript.Echo clDrives.Item(i)
Next
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