[android-developers] Many Contacts have the same lookup_key

I just moved from Contact _ID to LOOKUP_KEY after reading the Android
document which says consider using LOOKUP_KEY instead of row ID. But
on one phone, many contacts have the same lookup_key. It is so
terrible.

I am wondering is this situation normal? And how does it happen? What
I can do for this situation? It seems to me that both ID and
LOOKUP_KEY are unreliable.

Any help will be highly appreciated!

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