Your percentages show how strongly your genome clusters with each Greek or wider Balkan regional pattern within the anchor set. A higher percentage means your DNA is more similar to people whose deep ancestry is tied to that zone over long timescales.
They're not a claim that your recent relatives were born there, and they don't track modern borders, ethnic identity, or politics. They simply describe where your DNA fits best within the Greek-anchored Balkan and Mediterranean ancient landscape.