Won’t lie to you - the shell boolean tools suck balls. It’s weird, I download your file and for X 1 3 and 5 Intersect actually joined them, and for 2 and 4 Subtract worked but only if I picked them in the correct order.
The only thing I can think of is something happened with the way those were created that was different or reversed from the others, or that since they were grouped, the group is causing some kind of weird heirarchy.
If you’re still doing it you can try using the other 2 boolean commands, but yeah it’s funky and terrible and I’m not going to pretend that Alias ever plays nice with solids. I have issues even when just using Alias primatives (like punching a hole in a block)