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I get different results from this and HIBP

If you read the bottom of the post, the complete phone number database has not loaded into HIBP yet. The results will likely change once it's done.

To be clear: I was listed on HIBP but not on this tool

Same here, my phone shows in HIBP but not in this tool

This seems to be more reliable. The obfuscated name and other info matched my own number.