The owner may change over time. But after ownership is transferred, the new owner becomes the issuer.
Say Alice (1aaaaaa) issues 10 of a new asset, SOUP, and then she transfers that asset to Bob (1bbbbbb). Bob’s address is now the owner and issuer. If I call get_asset_info for SOUP I will get an issuer of 1bbbbbb, because Bob is now the issuer.
However, the historical ownership of SOUP is still available. If I call get_issuances, I will see 2 entries:
10 SOUP with issuer: 1aaaaaa (The original issuance)
It seems that the 3rd party service Blockscan defines issuer as the original owner, which led to the confusion. I’ve updated the statements in the first post.