YOU SAID:

I don't understand the source of your confusion.

INTO JAPANESE

私はあなたの混乱の原因を理解していません。

BACK INTO ENGLISH

I don't understand the cause of your confusion.

INTO JAPANESE

あなたの混乱の原因がわかりません。

BACK INTO ENGLISH

I don't know the cause of your confusion.

INTO JAPANESE

あなたの混乱の原因はわかりません。

BACK INTO ENGLISH

I don't know the cause of your confusion.