Direct Sun Hours analysis showing noisy mesh

Hi! I’m doing a Ladybug “Direct Sun Hours” analysis in Rhino/Grasshopper, but the result mesh/grid looks weird (stripy/noisy).
I already tried setting grid size/offset and turning on “Shade vertex colors” in Rendered mode, but it’s still not correct.
Could you please take a look if I send you my screenshots

Select the component for analysis grid geometry in Grasshopper, right click, and hide the preview. This has been asked on the forum many times. I’m surprised that the solution didn’t come up in your search.