Mentions inserted via insert menu are broken

Location : https://extranet.atlassian.com/pages/viewpage.action?pageId=2413629868 User-Agent : Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36 Referrer : https://extranet.atlassian.com/pages/editpage.action?pageId=2413629868 Screen Resolution : 1440 x 900 User Name : dnavarro Current Dark Features : cq.bigsearchbox,confluence-inline-comments-resolved,confluence-monitoring.hibernate.enable,federated.search,adg.email.enable,jirachart.createdvsresolved,file-annotations,tasks2,view-file-macro-placeholder,view-file-macro-insert-from-drag-and-drop,show.business.group.in.user.hover,remove.attachment.button,confluence-inline-comments-rich-editor,blueprint-retrospectives,confluence-questions,heatmapper,cq.space,notification.plugin.api.enabled.com.atlassian.confluence.plugins.files.notifications.event.FileContentMentionUpdateEvent,quick-reload-inline-comments-flags,view-file-thumbnail,jirachart.twodimensional,total-comment-count,view-file-macro-convert-to-thumbnail,quick-reload-inline-comments,pdf-preview,blueprint-jirareports,notification.plugin.api.enabled.com.atlassian.confluence.plugins.files.notifications.event.FileContentUpdateEvent,previews.versions,confluence-monitoring.enable,notification.plugin.api.enabled.com.atlassian.confluence.plugins.files.notifications.event.FileContentRemoveEvent,hipchat.chatbar,previews.conversion-service,content.rank,wiki.macro.disable.antisamy,notification.plugin.api.enabled.com.atlassian.confluence.plugins.inlinecomments.events.InlineCommentResolveEvent,previews.trigger-all-file-types,view-file-macro-insert-from-exclamation-mark,view-file-thumbnail-polling,jira-placeholder,confluence-highlight-internal-non-privacy-policy-safe-events,confluence.request.access.enable,email-tracking,confluence.dark.feature.view-storage,file-notifications,ondemand.marketplace.prototype,file-annotations.likes,blueprint-decisions,notification.plugin.api.enabled.com.atlassian.confluence.plugins.sharepage.api.ShareAttachmentEvent,confluence-inline-comments,confluence-inline-comments-dangling-comment,notification.plugin.api.enabled.com.atlassian.confluence.plugins.sharepage.api.ShareContentEvent,notification.plugin.api.enabled.com.atlassian.confluence.plugins.mentions.api.ConfluenceMentionEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.security.ForgotPasswordEvent,notification.plugin.api.enabled.com.atlassian.confluence.plugins.tasklist.event.SendTaskEmailEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.page.async.PageMovedEvent,previews.sharing,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.attachment.AttachmentBatchUploadCompletedEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.comment.CommentCreateEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.comment.CommentUpdateEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.follow.FollowEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.page.async.PageEditedEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.blogpost.BlogPostCreateEvent,notification.plugin.api.enabled.com.atlassian.confluence.plugins.inlinecomments.events.InlineCommentCreateEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.like.LikeCreatedEvent,previews.sharing.pushstate,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.blogpost.BlogPostUpdateEvent,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.page.async.PageCreatedEvent,notification.plugin.api.enabled.com.atlassian.confluence.plugins.hipchat.api.events.HipChatUserMapped,notification.plugin.api.enabled.com.atlassian.confluence.event.events.content.blogpost.BlogPostMovedEvent SpaceTheme : theme-default aui-layout aui-theme-default VersionNumber : 5.8-m18