How do I stop singing two notes at the same time?

My throat does this weird thing where it sings two notes at the same time so my vocals never sound clear to me or in audio. It sounds very vibrate-y or fuzzy.

I just started singing in 2024( hadn’t sung out loud in 10 years due to trauma) and this randomly happened when I woke up one day but I can’t control it.

Sorry I don’t know how to upload an audio on here