What are examples of lifetime gold years that are not lifetime platinum years?

i have two more lifetime gold years that are not platinum.

the first one I believe to be my first year as a starwood member , I qualified for gold but did not make platinum, I understand why that one should not count. Since I made platinum every years since then at starwood, it stands to reason that the other gold but not platinum year would have been through Marriott, I am trying to figure out what it could be from (and if it should be platinum).

note that I never had Marriott status through an airline status match or benefit.

any help would be appreciated , for some reason our friends and loyalty partners at corporate consider helping loyalty members to be a questionable way to do business , it is proprietary in their words, I am not sure why (maybe members are overly entitled or just a nuisance around the edges )