[Genome] Question about rs17182545

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Dear Sir:

When I check the flanking sequence around a SNP (rs17182545, location: chr21:46,528,767) using the Genome Browser, 
the flanking seq is "AGTCCTTTCA  T  TAGGCTGGGA", and the SNP is "T". Yet, when I link to the SNP hyperlink on
the Genome Browser page, the the observed nt should be A/G(reference allele: A), and the dbSNP flanking sequence is 
"TCCCAGCCTA  A/G TGAAAGGACT".

Those information about rs17182545 is obvious different. Could you explain why?
Thanks for your help, and look forward to your response.

Sylvia
IBMS SINICA, TAIWAN