[SOLVED] editing article's title problem

I made one article in a category. As I wanted to change the title, I clicked the edit button of the article and changed the title. Instead of saving the title hasn't be changed. I can see Atahualpa editing area below in editing area. Do I have to change the all of "bfa_ata_body_title" instead of changing the title area?
Any suggestions are appreciated, thank you.