1) Our narrations indicate Prophet Ibrahim (a) passed away in Chaam. Chaam is basically the Levant (area that encompasses part of Syria, Lebanon, Palestine and Jordan). Most scholars accept that he passed away in Hebron.
2) The shrine in Iraq is not the burial place of Prophet Ibrahim (a). It is supposed to mark the place he was saved from the fire of Nimrod.
3) Some religious shrines have indeed become widespread without basis. But for many of them, there is a basis