That day a hacker deleted 70 of my posts and then I asked my host to restore my site from their last backups and they did it.
Then when I entered into my dashboard and found some deadly issues. Some plugins is asking me to go to in it's setting and then re-save it's setting. But after saving their settings they cannot save that data! they again asking me to do that and again I do that and click on save button. And again asking me to do that. This plugins seems that they cannot save it's own data!