Half amount of RAM

So I've been running into this issue where my system has been showing only half of my available memory. I've recently got cpu-z and opened it up to look at my slots and all 4 show ram in them but with 8gb modules when they are actually 16gb modules and single rank when I believe they are dual...

32.0GB (15.9 GB usable) I've reseated the RAM, changed the paging file size and memory size management and every other YouTube trick. Still the same. What do? Put HW specs here: View: https://imgur.com/a/lfxEiFc