Why does the highres.fix downsample even with dimensions divisible by 64?

[Taikakim]

For an example, 2,5x scaling on a 512x640 image would be 1280x1600. Still during the process the init image gets downsampled to 320x400. Why is this? This is using the LDSR upscaler.

[TheLastBen]

I think you will get better answers for that issue in https://github.com/AUTOMATIC1111/stable-diffusion-webui