Surprising ethnicity results?

[Merry]

We had expected OH's results to show about 50% Spanish and our children to be about 25% Spanish.

Instead, OH's shows 7% and our children about 5%.

OH's father was from Barcelona and though we don't have his tree going back very many generations, there was no movement from that area for the time span we have covered. We do know for certain that OH's father was his biological father, thanks to the results of a DNA test required for OH to have the correct father's name put on his birth certificate (long story and several other threads here about that!).

OH's results show a higher percentage for France (32% - but no known ancestors from France), our son's results show 8% France and our daughter's 0% France.

OH was reading an Ancestry forum where many people were complaining that their Spanish ancestry didn't show up anywhere (or that it had switched from Spain to France recently), but no one seemed to have an explanation.

Any idea why this would be?