Congress didn't actually allocate additional funding for FEMA, what they did was 'unlock' the 2025 budget allocation early. The 2024 hurricane season has been an especially bad one, with five out of nine hurricanes making landfall so far and two major hurricanes back-to-back. For comparison, in 2023 there were only three major hurricanes (two C4 and one C5), of which only one made landfall in the United States. Likewise in 2022 only one major hurricane made landfall in the United States.
So basically, the FEMA budget allocation is based on the assumption of an average hurricane season cost, which is generally going to be spent with ONE major and a couple of regular hurricanes. The 2024 budget got spent on. . . one exceptionally bad major and two regular hurricanes, so Congress unlocked the 2025 budget early to hopefully cover the rest of the year, only now we've gotten *two major hurricanes* which are projected to use up pretty much all of that.
It's not anything sinister, just *three major hurricanes* is a hella bad year.