wmi filter only works when negated twice

has ever saw before and/or know whats causing it?  when try run query filter of 10.1.% doesn't return anything.  when negate filter twice, getting data looking for?!?! 

ps c:\> gwmi -namespace root\microsoftdns microsoftdns_atype -filter "ipaddress '10.1.%'" | select ipaddress -first 10
ps c:\> gwmi -namespace root\microsoftdns microsoftdns_atype -filter "not not ipaddress '10.1.%'" | select ipaddress -first 10

ipaddress
---------
10.1.91.3
10.1.91.4
10.1.91.1
10.1.91.5
10.1.91.6
10.1.91.2
10.1.27.45
10.1.27.41
10.1.72.9
10.1.27.61


ps c:\>

i never liked -filter pipe

...| {$_.ipaddress -like "10.1.*"}

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