Noticed IKEA more expensive in Dublin than Belfast

Dopey

I was in IKEA Dublin yesterday and noticed a 15% difference in the price of one item that I new the price of in Belfast. This is after taking into account the VAT and exchange rate. I checked the web site to see if the price had changed up north and it hadn't.

Kitchen chair cushion £4 in Belfast and €5.75 in Dublin.

Convert £4 GBP to EURO = 4.70536 EUR (1 GBP = 1.17634 EUR on www.xe.com)

Add the VAT difference (6.5% Is this correct?) 4.71 + 31c = €5.02

That works out at 73 cent difference or roughly 15%. IKEA stated that the prices were the same in the south as the north. Am I missing something