Can’t downgrade iCloud storage

I’m currently paying for 200 GB iCloud+ storage. However, I’m only using 46 GB, and today I deleted a a lot of videos so soon even more storage will become available. I went into iCloud settings to downgrade to 50 GB, I clicked the approve button on the downgrade warning (“if you use more than 50 GB you’ll need to free up more storage”). But after that, it still says that the 200 GB plan will auto renew next month. I tried this on both my iPhone and iPad, but both give the same result: after the confirmation button is clicked, the downgrade menu just spins around and shows that the 200 GB will auto-renew next month, even though the 50 GB has a check mark next to it. How should I interpret this?