Edits in online library don't update in Word

hi,
Apologies for the noob question, this is my first time using Endnote.
I’m using Endnote online. Sometimes I have to add information that’s missing when it’s imported.
I’m used to using Refworks, and when I edit a reference in that, it updates all the references in Word automatically.
Problem is, when I edit a reference in Endnote, the original reference seems to be duplicated into a “travelling library”? and the edited reference becomes a new reference.
Am I doing something wrong, is there any way I can can stop the reference being duplicated a nd copied to the traveling library?

Thanks in advance

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