我对这个问题还有一些疑问，翻译

I still doubt about this question.
I am still puzzled with this question.

I still have a little doubt about this problem.
The problem still puzzled me.

I am still not sure about this problem.

不错。i am still puzzle with the problem

是真的一个题目对吧？
I'm still not quite clear about the question.

i still have some puzzle about this question