Are the burner head and burner cap positioned properly?
Cap must be seated on the burner base to light and perform properly. Reinstall the burner cap, making sure the alignment pins are properly aligned with the burner cap. The burner cap should fit flush with the burner base and have a very little side to side movement.
CLICK HERE for more information and a video about Burner Head and Cap Positioning.
Are any of the surface burners wet?
The burner(s) could be wet from a spillover or from cleaning. This can cause a popping noise.
Allow the burner(s) to completely dry and replace the burner cap. You can speed up the process by blowing cool air on the area using a hairdryer.