Grid Row 1/4 Problem

Hello Team Kriesi,

i try to align 4 pictures in 1/4 Grid Row perfectly with 0 px padding left on the first picture and 0 px padding right on the right picture. Between all picture is a 8 px space, so i set the padding to 4 px each. Pictures are 262 px width, Container is 1079 px.

My problem is the white border on the left and right pictures. I tryed to make all pictures few px smaller or bigger but no success. Maybe a bug? Nor border selected for this grid row in options.

Thanks for your help