Not all Post Authors showing in Sidebar

Not all my auth开发者_开发知识库ors are being displayed in sidebar widget. One in particular has multiple published blog posts.

The problem arisen when a database was backed-up and restored on another server. Both databases, and code should be identical.

Its the standard authors widget that comes with wordpress.

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Have you tried removing the widget completely (not saving it in inactive) and then re-adding it?