Natural gas range emits kerosene/propane burner odor
Yes, you have a problem!  An orange flame, as opposed to a blue one, indicates too much fuel and not enough air (i.e. a RICH combustion condition) that is very dangerous.  Excess CO is produced in this case and can be deadly.

Get a qualified service tech to correct this immediately and don't use the oven until it's fixed!

With respect to your igniter question.  I think it's unlikely that the igniter itself is at fault but perhaps the gas valve was disturbed during the servicing of the igniter.