Window position changes after pasting text or submutting a dialog

I'm using Ckeditor 4 for some inline-editing. Everytime I submit a dialog or paste in some text, the windows scrollposition changes. The page suddenly scrolls a bit down, but far enough for the content that is being edited, to disappear from screen.

Is this a (unknown) bug or is it a known issue with a simple fix? I can't seem to reproduce this issue on the demo page of Ckeditor.

I already updated the editor to the most recent version (4.4.)

The config file is also very basic. So I can't seem to figure out what causes the window to scroll down after I submit a dialog window.

CKEDITOR.editorConfig = function( config ) {
	// Define changes to default configuration here.
	// For complete reference see:
	// http://docs.ckeditor.com/#!/api/CKEDITOR.config

	config.toolbar = [
		{ name: 'document', items: [ 'Source', '-', 'Cut', 'Copy', 'PasteText', 'Undo', 'Redo']},
		{ name: 'text', items: [ 'Bold', 'Italic', 'Underline', 'Strike', '-',  'NumberedList', 'BulletedList', 'align']},
		{ name: 'paragraph', groups: [ 'align', 'list', 'indent' ] },
		{ name: 'links', items: [ 'Link', 'Unlink', 'Anchor' ] }
	];

	config.enterMode				= CKEDITOR.ENTER_BR;
	config.forcePasteAsPlainText	= true;

};