Disclosure indicator moves slightly when 'edit' is pressed with grouped UITableView

I've changed my UITableView to be grouped in Interface Builder (which looks so much nicer!), but now the Disclosure Indicator against my UITableView row moves a few pixels up and right whenever I press my edit button in my navigation bar (at the same time as the red delete buttons move in)!

Has anyone seen this before or got any suggestions?

Edit:

Ive added a screen shot to this question. While it is very hard to notice even on these large screen shots, the chevron in the upper right corner of the second picture is a few pixels up and right of the chevron on the first picture. This is obviously more apparent when it moves in front of your eyes. On the second picture, the edit button has been pressed (whic开发者_开发知识库h you can tell, because the delete icon has appeared)