Why do I keep getting one yen?

[Gareth]

I have my NISA and iDeCo with Monex. I only invest in emaxi-slim all country and have nothing in my taxable account.

For the past few months, I've been receiving a deposit of one yen.

銘柄 - 日興ＭＲＦ
口座区分 - 特定
商品区分 - 投信
取引区分預り区分 - 再投資（累投）普通預り
受渡日 - 2024/10/31
数量単価 - 1口10,000
受渡金額 - 1円

What is this? Why am I getting it? Why isn't it automatically being invested?

I realise it's not the world's biggest problem but I would like to know! Thanks for any light that can be shone!

[William]

I'm not very sure about this. However, I believe that this "日興MRF" is a temporary fund of sorts, where our money goes between the time we send the order and the time we properly receive the shares we bought. It remains there for a few days.

During those days, despite the very short period, some kind of yield took place.