_eprint in the "Extra" field

I sometimes get _eprint: <url of the journal article> in the Extra field when I import the metadata from a website using the Zotero browser plugin. For example:

https://doi.org/10.1002/2016GL067757

This causes this strange text "_eprint: . . . " printed by the Better BibTeX plugin in the generated reference list, since the Extra field is used to store some important fields which aren't directly supported by Zotero.

How do you fix this problem? Because this is a big publisher in my field, I constantly get "_eprint" and I don't want to edit the field each time.

What's the origin of the field "_eprint"? What's its difference from the URL field? (For this publisher, both fields are the same URL.)

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