assumption that chains only affect columns is a bad due to U-mapper property.

Line 139 in b7fc232

return c.Cols * c.ChainLength, c.Rows * c.Parallel

I use the following RGB-matrix params for my panel: --led-gpio-mapping=adafruit-hat-pwm --led-rows=32 --led-cols=64 --led-multiplexing=1 --led-chain=2 --led-brightness=60 --led-pixel-mapper="U-mapper" --led-show-refresh --led-slowdown-gpio=4

I have two 64(w)x 32(h) panels, stack on top of each other to give me a total 64x64. They are chained but also use the U-mapper to wrap the extra pixels around to underneath. more info on U-mapper -> https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/examples-api-use#remapping-coordinates

Working on a fix here. I have no way to test this with real hardware, so we'll see how it goes for you once I release it.

Release https://github.com/robbydyer/sports/releases/tag/v0.0.79 has the fix. Give it a try and let me know