I’m working in R using terra and sf. I am working with some data products that are in sinusoidal projection (see crs string below, I can’t change the starting product projection) and I need to reproject them into a different equal area projection (currently selected EPSG:9311, but open to suggestions) so that other people can use and interpret the maps more easily. The issue is, when I reproject, the data seem to shift eastward about 2 grid cells. I think this has to do with some kind of rounding bias, but I really don’t have an explanation of why this is occurring. Can you help?

I have a high resolution raster (highRes), and a lower resolution raster (lowRes), and I would like to return, for every low resolution cell, the values and the percent coverage of the high resolution cells, in each low resolution cell.