Invalid signature using signing message method

[tin-snowflake]

Description

I use a method signMessage to sign a message. However, seems like the signature is incorrect. I use this method below to verify

import { sign_detached_verify } from 'tweetnacl-ts';

// Sign the message using walletContext.signMessage => FALSE
const signer = new HexString(walletCtx.account.publicKey?.toString());
const hexMessage = HexString.fromUint8Array(message).toString();
const signature = await walletCtx.signMessage(hexMessage);
sign_detached_verify(
    message,
    new HexString(signature).toUint8Array(),
    signer.toUint8Array()
)

// Sign the message using signHexString of AptosAccount => TRUE
const mockAccount = new AptosAccount();
sign_detached_verify(
    message,
    mockAccount.signHexString(hexMessage).toUint8Array(),
    mockAccount.pubKey().toUint8Array()
)