I have two EU citizenships (and passports). A few years ago I travelled to Spain on my old EU passport (citizenship). I shall call it other passport from now on.
But now every single time I visit Spain with my new EU passport (citizenship), they are always confused that somehow they can see in their system that there is another person with the same name, and same date of birth (and other similarities). I get questioned about it, but luckily I had my other passport with me every time and that solved things pretty quickly. On at least two occasions I was asked if I ever lived in Spain, which I found a bit odd at a time.
I know it's not a huge deal, but it's causing unnecessary delays and I'm worried that if I don't carry my other passport with me, it may cause even more delays. I don't want to carry both passports with me.
Is there anything I can do to avoid this in the future? Is this normal procedure for dual citizens that in the past used the other passport to travel to a particular (EU) country? Should I expect the same thing when I visit other EU countries that I visited in the past in my other passport.