I have an organized defense against the fact that the Raptor was dramatisized in the movie.
My 1st theoryIn the book, Dr.Grant was talking to Tim. Grant asked him if he knew (something. Sorry, forgot the exact words)
Tim said "Deinychus"
And grant said "Actually, Deinychus is now considered a Velociraptor. But very nice."
So, they where ACTUALLY breeding Deinychus, but to save time and confusion, referred to them as "Raptors" and "Velociraptors"
My 2nd theoryThe animals they where breeding weren't true and blue dinosaurs; the small stuff was filled in with Frog DNA. Maybe, during the Raptor Breeding process, the frog DNA slightly mutated it to be larger than a run-of-the-mill raptor.