The Girl on the Train question

I don't know about the rest of you guys, but so often here, while updating my reading progress, I find that Goodreads has vastly underestimated the number of pages in the books I am reading Currently I am reading The Girl On The Train, and last night reached page 361, but when I went to update my progress, Goodreads' had stated that it only had 336 pages, yet the copy I am reading (not an updated or expanded version as far as I am aware) has over 400 pages. This has happened on a few occasions now and makes me wonder if Goodreads really do their research thoroughly enough on this subject.
Has this ever happened to any of you guys too?