I'm 100% certain you are mixing up poison oak and poison ivy. People do this non stop here in the midwest, but in the reverse of what you're doing funny enough.

Check this page out for a map of known ranges of each species: https://www.poison-ivy.org/poison-ivy-overview

Poison oak, Toxicodendron diversilobum, looks somewhat similar to eastern and western poison ivy (T. radicans and T. rydbergii), but are all different species. Neither poison ivy species really occurs in California.