Mistake in HP??

[lisavision at yahoo.com]

Original Yahoo! HPFG Header:
No: HPFGUIDX C1080
From: lisavision
Subject: Mistake in HP??
Date: 4/16/00 5:54 pm  (ET)

when sirius black told harry he got him the firebolt, he said his vault
was number 711, next door to harrys. but harrys was not 713! 713 was
where the philosophers stone was.... we dont know what number harrys
vault is. and it wasnt 712, because they had to make a long journey from
the philosophers stone vault to harrys vault.

can anyone explain this?
Lisa