It's odd, when I edit an issue and modify the Components field I am allowed to select multiple options. However, as soon as I save, all but the last option selected are removed & only one remains.
Atlassian JIRA Project Management Software (v6.3.7#6337-sha1:2ed701e)
That's not how JIRA normally works. As you say, the field is multi-select and handles many values. I suspect someone may have implemented (badly) a tweak to make it single item somehow.
Does it lose all but one value on all three of Create, Edit and in-line edits? Could you check the history to see if it's only storing one change or two (one with your selection, then a second shortly afterwards with only one)
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