Hi Yuhan,
In Results -> SNPs(annotations), the Nearest gene, the nearest gene is HABP2 because the snp's position overlaps with the range of this gene.
SNP rs189256817 position: 115344875. This overlaps with the range of the gene HABP2: 115310596 - 115349361. You can also see it in this image:

For the mapping step, you used the default parameters for position mapping, which also map SNPs to gene within 10kb:

In this case, the
SNP rs189256817 is within 10kb of the range of the gene NRAP (115348475 - 115423886).
Best,
Tanya