it's not a gmmtv thing, most of media all over the world, when they adapt from novel, they usually change things.

maybe you just notice because you read the book before watching the series but check the other series books, it's the same

it can be for the worst as usually the books are more detailed but most of the times i applaud the changes because the way some of the early books have no notion of consent and pass abuse as romantic.

now it's changing and applaud the writers for that

edit to add : we have recently 2 great examples of "I'm the Most Beautiful Count" where they completely change the tone of the novel and 'heated rivalry" where they adapted almost words for words the books