Bot code seems to fire off before the it even has the chance to get called

I've written some code to check and notify the user that they're not supposed to be using a specific channel if they're not in voice chat. The code is as follows:

const { Client, GatewayIntentBits } = require('discord.js');
require('dotenv/config')

var guildID = "1128642534483****"

const client = new Client({
	intents: [
		GatewayIntentBits.Guilds,
		GatewayIntentBits.GuildMessages,
		GatewayIntentBits.MessageContent,
		GatewayIntentBits.GuildMembers,
        GatewayIntentBits.GuildPresences
	],
});

client.on('ready', (c) => {
    console.log('The bot is ready')
})

client.on('messageCreate', message => {
    console.log(1)
    if (message.content !== "") {
        console.log(2)
        if(!message.author.bot) {
            const Guild = client.guilds.cache.get(guildID); // Getting the guild.
            const Member = Guild.members.cache.get(message.author.id); // Getting the member.
                if (Member.voice.channel) {
                console.log(`${Member.user.tag} is connected to ${Member.voice.channel.name}!`);
                } 
                if (!Member.voice.channel) {
                console.log(`${Member.user.tag} is not connected.`);
                message.reply({ content: 'This is the voice chat channel.'})
                    .then(msg => {
                setTimeout(() => msg.delete(), 7500)
                })
            };            
        }             
    }
})

client.login(process.env.TOKEN)

The issue I'm having is that, let's say I join voice chat -> save the code (deploy the node) -> leave voice chat -> then type something, it seems to think I'm still in VC and throws me the 'This is the voice chat channel' message (I believe it's being run on deployment, and then never again).

And it just keeps on returning the same value, regardless of how many times I leave/join VC. I need to restart the node in order to get the bot to actually run the code again.

I must add I'm very new to both JS and Discord.js, I've read a bit on async functions thinking that might've been the issue but I still can't get my head around it. I appreciate any and all help.

This looks like a caching problem. Notice how you pull both the guild and the member from the cache, e.g. client.guilds.cache.get(guildID). If the cache has not updated since being deployed, your user is still in there as being in the voice channel. I could not find clear information about when exactly the cache is updated, but I suggest that you get the objects via the fetch command:

const Guild = await client.guilds.fetch(guildID); // Getting the guild.
const Member = await client.users.fetch(message.author.id); // Getting the member.

Notice how this command is asynchronous, returning a Promise, so you must either await its completion or use a .then() construction like those you are already using.

Edit: As discussed in the comments to this answer, the problem was actually the missing GUILD_VOICE_STATES intent, as discussed here.