When a user works with large content in the editor and pastes a word in the end of it, the page and content area are scrolled to the top. This causes an inconvenience for the editing behavior, the user should scroll down to continue typing or editing.
Not sure if this is the same bug, but when Paste as plain text is used, page is scrolled to the top in FF, chrome, opera. Clip from telerik demos: http://screencast.com/t/YKnCd2Kzw9G
The issue is fixed and will be available in Q2 2014 SP1