Do not hesitate to post a comment if you see a mistake!
NOTE : If the sentence does not belong to anyone and you know how to correct the mistake, feel free to correct it without posting any comment. You will have to adopt the sentence before you can edit it.
Important! You are about to add a translation to the sentence above. If you do not understand this sentence, click on "Cancel" to display everything again, and then click on the sentence that you understand and want to translate from.
Please do not forget capital letters and punctuation! Thank you.
"I wonder why."
than a
"Why?"
and I think it's less of a question and more of a statement.
Looking at Google it appears to be about half and half split between ？ and 。
Also the ？ is a relative newcomer to Japanese. In explicit questions, as long as you have the か at the end you don't need the ？ at all.
Anyway, long answer short, it might be best to unlink this sentence from "Why?" and link it it to a new translation with "I wonder why."