Half-bridge gate driver fried, how can I make my design work?
Make sure the 12V supply comes up first, it needs to happen before the 24V rail to ensure the gates are off. The big 380uF cap is probably preventing the 24V rail from coming up and depending on the supply the time constant could be in the millisecond range.
Put a scope on the gates of the fets (use GND of QL for the ground of the scope) when your powering up, they should be 0V while powering up. There may be a short amount of time where there is a transient from the board layout and both gates turn on at the same time.