The Treaty of Ghent ending the war was signed December 25, 1814 yet the Battle of New

Orleans occurred January 8th, 1815. Why would the fighting continue after the war was

over?

Simply because technological limitation preventing instant messaging across the Atlantic

Explanation:

Jackson and his soldier in New Orleans were thousands of Miles away form Ghent, so neither the British Soldiers nor Jackson knew anything until the treaty was signed and delivered across the Atlantic and THEN has to be delivered by horse to Jackson by some Government messenger