When retrieving multiple game id's, description is parsed only for the first one

[Babanel]

 var collection = mutableListOf<Item?>()
    val items = mutableListOf( "173346", "526", "8790")
    val service = BggServiceFactory.getThingService()

    service.getThing(items.joinToString(), 1, 0, 0)
        .enqueue(object : Callback<Items?> {
            override fun onResponse(call: Call<Items?>, response: Response<Items?>) {
                val body = response.body()

                collection.addAll(body!!.items as Collection<Item>)
                collection.forEach {
                    println(it?.names?.get(0)?.value.toString())
                    println(it?.description)
                }
            }
            override fun onFailure(call: Call<Items?>, t: Throwable) {
                println(t)
            }
        })

When used like above, except the first item, all of them have null descriptions