The moths turned into Glowy Moths when they touched a bug-shaped device from Romeo, that had the power to make machines malfunction. The effects wore off by the end of the episode, so it's unknown if the Glowy Moths will make another appearance.
The Glowy Moths can malfunction and shut down any machine they touch with their little feet. They can also power up Romeo's lab when he sucked them in with a vacuum invention.
The Glowy Moths are identical to the typical moths, except that they glow like Motsuki, but unlike her, they don't have any marks on their wings, bodies, and heads, and their glow only last temporarily for one night.