Perforation mode staggers lines

I’m trying to create a grid of short lines using perforation mode. I’ve staggered the lines since I don’t want them to touch. The vertical lines look on but the horizontal lines, which are parallel, are offset in the preview. I have no idea why. My alternative method will be to make a whole lot of short lines using the array tool. But I was hoping to get the right look with perforation mode. Any suggestions?