It might be generally not be able to use 4 sticks.
There are a few topics searchable in google about it, for one: https://www.reddit.com/r/buildapc/comments/13nk4of/2_vs_4_sticks_of_ram_and_clock_speeds_on_7950x/
Or it just might need tweaking, don't ask me I'm not or Zen 4.
But yeah, in google is very common 4 stix problem: 7950x four sticks RAM