Yes you will find that because the guy (Paul) has purposely done that to make PCB design easy. It doesn't matter in what order you connect the address lines to the RAM/ROM. It will only change the physical address of the data inside the memory. If you want you can connect it in proper way. It won't affect the circuits working.
Read this note given at the bottom of the same page that I suggested you.
"This unusual address bus wiring works. The 74HC373 chip (U2) is 8 identical flip-flops, so it does not matter which one is used for each line. On the RAM (U3) and Flash ROM (U4) chips, all data that is stored in these chips is written by the 87C52 chip (U1), so it does not matter which physical location within the chip is mapped into each location within the CPU's address space, because each read from these chips will return the same data that was written from a previous write."