PHP Server not returning data in another country


I made mobile app with delph firemonkey, and my own lamp server, MySQL has two tables and everything works perfect locally (data from BOTH tables) – in local network or from outside, BUT I get very strange problem, when friend is trying to use app from another country, it reads first table fine, but when need to get data from other table – receives nothing?

I tried to debug but simply when he is trying to access from another country, PHP returns NOTHING? How is this possible? Is his ISP filtering something? (if yes, how I can read data from table1 in app)?

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