As 'finnw has mentioned, almost 50% of 4-digit numbers have at least one repeated digit, so there is high chance of ending up with such a number. FWIW I have 2

As 'finnw has mentioned, almost 50% of 4-digit numbers have at least one repeated digit, so there is high chance of ending up with such a number. FWIW I have 2 UK cards from different banks where the PIN has no repeated digits. I suspect you're seeing a pattern where there is none. Incidentally, codes with repeated digits make it harder to guess your code based on fingerprints, as there are more possible combinations.