VerifySignature returns false

[Razorholt]

The function verifySignature() receives all data correctly but at the end, pubKeyAddress gives the wrong address. Here are the data I get from inside that func:

$message: Sign this message to validate that you are the owner of the account. Random string: 6225645ede729
$signature: 0xf9ac42e2c7c2b0fb31064a454b2058147fc78d2c989cc509b33ba30f6cc493253337882c1f88fe464a2e6fe51edec12cab38fb63f480fa6f0192e49736c57c671b
$address: 0x6d364052fa694dc9******36aa8eb43490e23d
$recid: 0
$pubkey: 0x43430e3cba19dcb**********e8b1421b871a88
(I masked the addresses on purpose)

Of course, it could be that the signature sent is wrong, to begin with... Any idea on what the issue could be?

Thanks!