Why Does My 6V to 32V DC-DC Converter Output Oscillate Between 42V and 32V?

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Problem solved! it is because the breadboard is faulty! Thank you

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Hi, I have recently built a dc-dc converter to convert supply voltage from 6V to 32V, the circuit diagram is as below:

 

 

 

and the circuit on the breadboard is looks like this:

 

 

My friend has built one with the same circuit diagram, I have double checked with him, both circuit connects exactly the same with same components, he circuit is working perfectly fine, but my circuit has a problem. my output voltage jump to the 42V, slowly drops to 32V, jump up again to 42V, slowly drops and it repeats this process over and over again. I have no idea what is wrong with it.

 

Here is how my friend circuit looks like:



 

Any help will be appreciate!

 

Thank you!