Four hours later, I already could login from a different device and from a different region/IP with the particulariry of not needing to confirm with an email's link. So, it looks like that some one is working on the system.
I also tried to login to my account again. I still get the error saying
Incorrect login details and have the same problem.
As I said, I am already logged in my account on another device and I am sure the email address and password I entered was correct.
I have one account with I never try to login from the other device or IP but few days back I was logged out automatically with in last few days I have many tries, but all time same message incorrect login details as I am trying no success hopefully things will be back to normal, but we still need some updates about these errors and other problems related to this site.
Even I am having not good amount on this site but still it's my old account and I don't want to have another which can create problems in future I already try to contact support but nothing happening.