The issue comes from the fact that in order to make the editor standard compliant and accessible we had to add a title attribute to the IFRAME which is the content area. When the tooltip manager has AutoToolTipify set to true, it replaces the title attributes with RadToolTips and thus this title attributes gets displayed in a RadToolTip.
What I can suggest as a quick fix for this case is to handle the OnClientLoad event of the editor and to remove the title from the content area as shown below:
function OnClientLoad(sender, args)
var contentArea = sender.get_contentAreaElement();
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