When I paste into my WYSIWIG editor i.e. article introtext or article fulltext.
Here's the exact issue I get. It adds a div, a data-source, some styling and a span.
<div id="_mcePaste" data-mce-bogus="1" style="position: absolute; left: 0px; top: -25px; width: 1px; height: 1px; overflow: hidden;"><span style="color: #444444; font-family: Verdana, Geneva, sans-serif; font-size: 14px; line-height: 25px;">n you paste into where? Int</span></div>
Some of the things I can understand i.e. the styling it inherits from the paste source, the position, width and height I really don't understand. In any case it's clearly not the right way to paste into the window, I just thought I would try to understand what is happening.