I suspect it’s the Celtic that creates the mismatch. Mine originally claimed I was 25% Irish. Now Spanish has increased to 60 percent and 10 percent Portugese. Celts inhabited the Portugal area and parts of Spain.
That could be. My biggest category: England, Wales and NW Europe, covers a heck of a lot of ancient tribes. Ancestry’s diagram of that region catches SE England, part of Wales, northern France, Belgium, Netherlands and part of western Germany.
Those areas are where many tribes that became English came from, and then mixed with the Celts, or the oldest tribes in England. I guess they all mixed so much no individual tribes can be identified now.