Edit: Learned how the packs work, not a bug. Thanks for the replies!
U can’t acquire another pack your welcome from ghost
Besides your three permanent unlocks you get from Warzone REQ Packs, it has come to may understanding from opening packs that the other cards you receive will be because of REQ certifications you have gotten before. My suggestion: try to open more silver and gold packs for permanent unlocks to try for more certifications.