Arcing when running mutiple tubes

@mcdanlj @JamesS sir, i am facing arcing problem when All the tubes run simultaneously, what would be the reasons for this behavior.

What machine is this?
The area you have circled is normal if it is inside the tube.
Is there a problem that caused you to post this?

This is 600W MDF cutting machine, the area I circled is sparkling inside the tube, when Allah tubes run simultaneously, when it runs individually, it works ok.