Offset not working

Hello! I am new to grasshopper and working on a definition made by someone else. I am trying to understand why the offset is not working as intended i.e. only some of the lines are being offset. I would like all the lines to be offset to create a perforation effect. Any help would be very much appreciated! Thank you!

perf (24.3 KB)

perf gt.3dm (155.1 KB)