IP tracking is not very accurate, many cable providers use NAT for their customers so they share IP addresses, also devices such as blackberry have new IP's on each requests as it's actually a blackberry server that load the content then compress it and serve it to the mobile phone.
Especially in Europe a lot of people are on company provided internet connections that use VPN so everyone got the same shared IP of the company.
I'm sure there's dozens of other reasons but this was just a few
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