He means when he wears certain PCB (meaning some of the mask ones, like Opera Masque) and he zooms out, the sprites tend to mesh together and look funky. It's because some of the masks originally takes up the middle and lower slots, but as a pcb, ONLY takes up the bottom. Then when you wear certain kahos, sometimes they're upper/middle, thus, a sprite overlay. That and we're supposed to only have a certain zoomout distance, which I think the server is set to override so we can zoom out more (as can be noted that clicking too far away your char won't walk to.)
I don't think you can do anything to fix it, I think it's just something that comes with wearing certain headgear combos.