Dmv Won’t Accept A Certified Birth Certificate?

Sorry if this isn’t allowed but I have autism and this is the only place I feel would have answers maybe. I sat at the Missouri DMV for hours just to get told my certified birth certificate from another state (from vital statistics of that state with the emboss and watermark) doesn’t count that the need the actual original. But when I ordered it from statistics several years ago that’s what they sent me and I was able to get a Real ID in California with the same birth certificate. Im really just confused and don’t know if there’s a difference because like I said I’ve been using that birth certificate with no issues for several years.