node.js - OrbitDB can't append data - p2p

Question

I want to use orbit-db to create database using Nodejs but every time I create a database and try to add a new data it deletes the last element and I only can read the new one. I tried different types of databases (docs, Keyvalue, log, feed) but it's the same problem every time.
Here is my code to create a database:
async function createDb() {
// Create IPFS instance
const ipfsOptions = { repo: './ipfs', }
const ipfs = await IPFS.create(ipfsOptions)
// Create OrbitDB instance
const orbitdb = await OrbitDB.createInstance(ipfs)
// Create database instance
const db = await orbitdb.docs('IOFY')
console.log("address", db.address.toString())
const identity = db.identity
console.log("identity ", identity.toJSON())
console.log("put data")
await db.put({ _id: 'ip2', name: 'shamb0t', followers: 600 })
console.log("get Data")
const profile = db.get('')
console.log("profile = ", profile)
console.log("close")
await db.close();
console.log("disconnect")
await orbitdb.disconnect();
}
It creates the database and displays its address. This is the read function, we need to provide the address of the database as an argument:
async function readDb(fullAdress) {
console.log("read function")
// Create IPFS instance
const ipfsOptions = { repo: './ipfs', }
const ipfs = await IPFS.create(ipfsOptions)
// Create OrbitDB instance
const orbitdb = await OrbitDB.createInstance(ipfs)
const db = await orbitdb.open(fullAdress);
console.log("address", db.address.toString())
await db.load()
console.log("get data")
const value = await db.get('')
console.log("value = ", value)
console.log("close")
await db.close();
console.log("disconnect")
await orbitdb.disconnect();
}
It displays only the last element I added to the database, it's like the last element overwrites the past elements. Why does this happen?