This is a bug in your custom style, not VaultWiki. The watched indicator uses XenForo's style property @dicussionListIcon which has a background-image associated with it in the default style. Your custom style has removed the background-image portion of its definition. And whatever icon it currently uses for @dicussionListIcon has not been included in the style property by the style's designer.
In your the vw_additional.css for your custom style, you can try adding:
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