bitcoin core – Generated new p2wpkh address from pubkey of existing address – but found it has old transactions!

this is certainly my lack of understanding, but it challenge what i know about blockchain.

I created a new address p2wpkh from public key with bech32 (testnet) on ‎2022-11-10
: tb1q9ctu2t7zqvlevcamga9dfdhvlpeh93qdz6aawk
Made one transaction on 2022-11-10 10:29

pseudo code

b_pubkey = bytes.fromhex(pubkey)
h160 = hash_160(b_pubkey)
segwit_hrp = 'tb'
encoding = Encoding.BECH32 
address = bech32_encode(encoding, segwit_hrp, [0] + convertbits(h160, 8, 5))

But in mempool it shows it has 3 transactions, goes back to ‎2022-11-07 15:10
https://mempool.space/testnet/address/tb1q9ctu2t7zqvlevcamga9dfdhvlpeh93qdz6aawk

aren’t addresses supposed to be unique and collision resistant ?

this is certainly my lack of understanding, but it challenge what i know about blockchain.

I created a new address p2wpkh from public key with bech32 (testnet) on ‎2022-11-10
: tb1q9ctu2t7zqvlevcamga9dfdhvlpeh93qdz6aawk
Made one transaction on 2022-11-10 10:29

pseudo code

b_pubkey = bytes.fromhex(pubkey)
h160 = hash_160(b_pubkey)
segwit_hrp = 'tb'
encoding = Encoding.BECH32 
address = bech32_encode(encoding, segwit_hrp, [0] + convertbits(h160, 8, 5))

But in mempool it shows it has 3 transactions, goes back to ‎2022-11-07 15:10
https://mempool.space/testnet/address/tb1q9ctu2t7zqvlevcamga9dfdhvlpeh93qdz6aawk

aren’t addresses supposed to be unique and collision resistant ?