Subfolder /blog keep automatic created

Hi there.

I have a wordpress installed in my paid server.
It was set up by me to have a static page/front page and a post page as blog.

After certain times, my url(www.mysite.com/blog) not appear correctly.
It comes with error like “index of my blog” and “parent directory”.

I make several check to identify the problem and found a folder created automatically named “blog”. I delete it and my blog appear successfully.

But this problem still occur till now. When It happen again, the same thing I do, delete the folder.

May someone help me to overcome this problem? If you need more information, I will give you asap.

Thank you.