EDIT: **Sorry I missed the 'some' part of the question**
Joey,
You removed the headers from the table, but you can see that the 2.4GHz channels (1, 6, 11) all show up as n(20), and the 5 GHz channels (36 an higher) show up as ac(20).
n in the table stands for the 802.11n standard and indicates High Throughput (HT)
ac stands for the 802.11ac standard which uses Very High Throughput (VHT), however on 5 GHz only.
802.11ac is a 5 GHz only standard, so the 5 GHz radio is 11ac, where the radio on 2.4 GHz is using 11n.
This is expected behavior. You can run ac(40) or ac(80) with 40 or 80 MHz channels, however that is only advised in an environment with very few AP's to avoid interference between different AP's.