Recording of WIKI registry notes

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Noticed in the Bell auction today that lot 1223 "Bank of Canada - 1972 - $5
BC-48aA - Bouey-Rasminsky - Replacement " was graded by PMG  as  AU55 , whereas in the registry it is an AU50 graded by BCS . What should be the actual official  registry grade?

What should be the actual official  registry grade?

When a note that is already listed on the wiki comes back onto the market, the new information (ie. grade, location, etc)  is listed with the old information and both are visible to anyone viewing the registry. So if someone looked at the Wiki, they would see that this note had been graded by BCS as AU-50 and now as a PMG AU-55.

On the wiki there are no "official" grades, just opinions of the seller or a TPG. A buyer should always do research about a note they are buying to find this kind of information. (ie. grade discrepancies)

In other words, the wiki information is cumulative.  New information does not supersede old information.  Frankly, I'm surprised a BCS AU-50 did not morph into a PMG Unc-64 

Frankly, I'm surprised a BCS AU-50 did not morph into a PMG Unc-64 

There have been a couple of times when adding notes to the wiki that I have seen things like that. (1954 $10 *B/V 0335639 for example)