Him
the schematic (drawing skills) could be improved. It´s hard do read because of
* open ends
* useless edges
* missing junction dots
* missing part values.
Also the schematic (circuit design) is rather confusing.
* What are the BC327 for? I see no benefit, making everything worse. They reduce current, reduce voltage, increase delay ...
* the complement information to BC327 is completely missing
* I can´t find IRFPC40 datasheet
* and so on.
PCB layout misses a clear GND plane and misses short, low stray inductance routing.
Unnecessary bends, unnecessarily changing layers ...
All this probably leads to
* cross conduction
* a lot of ringing
***
My recommendation: Don´t rely on hobbyists circuits. Read through some application notes on high power switch mode circuit design. Read design notes, look for reliable example circuits. Learn how to design properly.
Then desgin the schematic a new. Show it so we can give advice
Then do the PCB design a new. Show it so we can give advice
Klaus