Set it to a higher number, then. The auto settings can cause screwed up graphics sometimes, as they don't always render in multiples of the Wii's internal resolution, but the numbers will.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT