I am not having an idea here what might be going wrong u can check for some of the attributes of rich text like auto focus or any thing is CSS or java script which is putting focus on it.
to check which element has focus once page has loaded press f12 go to console and type
document.activeElement
this will tell you whihc element in the rendered page has focus. now you can use this info to remove the focus by trouble shooting it.
Hope it helps