4x32 = 128bit = Dual Channel.
I have the same problem but i used aida 64 extreme to see the problem too. With Aida, single channel is 64bit and that is what it said my system was running at.
Right above that, it reads the ram is capable of 128bit. Yesterday, december 4, 2023, Aida 64 extreme had an update to version 7.0. It now reads in the motherboard-chipset section, that im infact running dual channel. There is a free trail with aida64 so feel free to download and check now, if you still have the same issue, in the section i mentioned.