Unmatched response on ItemLook Up based on UPI

Unmatched response on ItemLook Up based on UPI

I have tried using ItemLook operation to identify an ItemId based on UPC
IdType. I expected to get a unique result, since it is based on UPC. But
for some of the queries made, more than one result came up and sometimes,
items clearly not related to the UPC comes up in response.
For example, made a lookup for "035000530271" item, which is a kitchen
degreaser. I got three responses for it: two of which were from the same
brand and variants, but the third response was of a metal surface polish.
How did this happen? UPC of an item linked to something totally different?
I was hoping that I could make use of Amazon APIs to uniquely identify an
item from its barcode number and get price details. Can you please help me
understand, if this is expected, ie more than one responses, even if its
based on UPC? Or if there is some other way of fine tuning the lookup to
pin point to correct result?
Thanks!