There is a switch that slides onto the shaft for each burner. When you turn the knob to a certain area it completes the circuit to the ignitor module. It sounds like you have a shorted switch. Unfortunately with most 'cooktops', these are not easy to get to.
It's also strange that only 2 are igniting, usually one module runs all the ignitors. When you turn one of the non-problem burners on, does it click when it supposed to and stop when it's supposed to?
The ignitors running constantly is annoying and may damage the module, but should not be dangerous unless you have other issues, ie., fuel leaks.
If you have access to basic hand tools and a multimeter I can walk you through the diagnosis.
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