a normal phusion pcr reaction is this:
Initial Denaturation 98°C 30 seconds
98°C - 5-10 seconds
45-72°C - 10-30 seconds
72°C - 15-30 seconds per kb
Final Extension 72°C 5-10 minutes
generally, the 45-72°C step you'd begin with 55°C
what program did you use to design the primers? something went very wrong somewhere.