Motor Incoordination

Hi. Im in hurry, i have limited days to finish my task.
I use pixhawk, emax rs2306 2750kv motors, ublox neo m8n gps, 50a hobbywing esc. The problem is that, when i try to launch my drone, the front side of it launches faster and it goes to flip and crash.
What should i do, what is the problem?

They’re cold be many and varied reasons.
Until you post a .bin log from the flight controller of the problem flights its not really possible to say.
The more information you give us the more likely you are to get meaningful answers.