It just so happens that sometimes, pages get skipped. It doesn't really mean anything. It's kind of a part of life.
Why do pages get skipped? Is it intentional? Not usually. Sometimes while writing, a body will get so caught up in their work that they don't pay attention as they flip the page. The time just isn't taken to separate one page from another - or - to make sure the pages have been separated.
On the other hand, sometimes it is on purpose. Sometimes a writer may just say, "I'm not really feeling those next pages.." and skips them. It isn't wrong. It just... is.
Sometimes, pages get skipped. It isn't right, wrong... good, or bad.. Like I said, it just is. You can come back to them if you choose to but it isn't really necessary. Though, I won't lie. Sometimes, it is enjoyable. :)