Thanks for the excellent pictures. It looks like the pulley wheel cage is bent. With the long cage, Suntour designed so that the chain could go between the upper and lower pulley. While that design makes it easier to install a chain, it also means that the cage is only a single piece in that area and therefore vulnerable to getting bent.

The two pulley should be inline with each other. These look to be off a bit. There may be other places that are bent as well. It may also be worth at least doing a visual inspection on the derailleur hanger.