Two reasons.
Some thick tart on either Chanel 4 or Sky thought Ireland was pronounced Island, or maybe thought it was spelt that way and exposed how useless half these journalists are on anything outside the M25.
It upsets fewer of the inhabitants of said island. The ones in the North who want the North to be in the South like the Ireland bit. The ones who want the North to be in Scotland like that the island is differentiated from Ireland.
Andy