Question: Do Genesis 1 and Genesis 2 contradict each other? Why is man mentioned being created in Genesis 1:27 and then again in Genesis 2:7?
No, the two chapters do not contradict. Genesis 1:1-2:3 gives the chronological account of what God created on each day. Man was created on the sixth day.
Genesis 2:4-25 gives a descriptive account, with man being the central theme, and is not meant to be chronological. Often in descriptive writing, facts are presented without being in sequential order. Since the chronology was already explained in Genesis 1:1-2:3, the focus then shifts specifically to the creation of man, giving the details about how he was created. Genesis 2:7 is simply an elaboration of Genesis 1:27.