indyank - 3:21 pm on Sep 19, 2012 (gmt 0)

Aren't you using canonical urls? Unfortunately in wordpress you can append any number towards the end like your example and it will return the same content as /example-page/.

The best way to handle this is by using canonical urls on your posts.

There are millions of wordpress blogs that suffer from this. Googlebot is probably discovering them thro. their buggy javascript crawler. Do you see any referrers for these links in your logs? If not it is surely the result of their js crawler.