Will someone please explain to me why the number of delegates needed to win has gone up from 2026 to 2118??

In order to win the nomination, the candidate must receive 1/2 of the pledged delegates, which was previously 2025. Since the 368 FL and MI delegates were added with 1/2 vote each, 184 delegates were added to the total. So, 92 delegates were added, which makes the new number 2118.