It turns out I was using a 64-bit 5.10 and 32-bit 5.8.6. but in some cases I see a more than twice difference between the 2 versions.
The 32-bit 5.8.6 gives me 851144.
The 64-bit 5.10 gives me this alarming huge number 49563404.
Any idea in what cases this could be so?