YOU SAID:
why is this a thing? i don't know
INTO JAPANESE
これはなぜですか?わからない
BACK INTO ENGLISH
Why is this? do not know
INTO JAPANESE
どうしてこれなの?わかりません
BACK INTO ENGLISH
why is this? I do not know
INTO JAPANESE
どうしてこれなの?私は知らない
BACK INTO ENGLISH
why is this? I do not know
That didn't even make that much sense in English.