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Inconsistency in total population

Hi,

I am using the gpw v3 density maps on Matlab and I do a spherical integration to compute the total population on the planet.
For every map from 2000 to 2020, I find 24% more than the UN projects. But the gap between SEDAC and UN counts only accounts for 2 or 3% in 2000 so there is another problem.

Is it because in cells with both land and sea, the density in the data is the terrestrial density ? It would explain why I get too much total population when integrating while considering that the density is applicable to the whole cell.

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