Feeds: Quality of metadata

I have tested the feeds of different journals in my field. For some of them, the main metadata displayed in the columns in the centre pane is extracted nicely (Title, Creator, Date, Publication, ...). But in most cases, a large part of the metadata extracted in not correctly attributed to the different fields, usually going all together to the field "Abstract". In the worst case, it could only get the title correctly.

Is there a way to improve the metadata extraction for each journal feed, as with the Zotero Connector?
Or is the problem coming from the publisher of the feed? In that case, what is the best way to report to them the problem? Is there any standard that they should follow so that it works nicely with Zotero?
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