Forum Moderators: phranque
Their logic is probably that they hope to replace your URL with theirs in the Google index, then change the content when they start getting traffic.
Alternative motive - cpompetitor hoping to get you "done" for dupe content. Infact - that second one could be a problem.
By the way - if you have bought some SEO and didn't pay sensible money, that could have been the result... If the metatags are different/better than your page, then I'd put that as a likely motive too.