Unfortunately, that likely means there are struggles loading the images on the specific device. It isn't a glitch as far as we can tell. But it doesn't only come down to the GPU, it could be a separate driver or graphics cards settings. Or maybe even a virus scanner is interfering with the game because it thinks it seems untrustworthy. And the sprites of Qiu and Tamarack are the hardest to display because they have more going on than the side characters, so that's likely why it's only them having trouble. I'm sorry for the issue.