another login has been detected

I am getting another login detected when I only have one page open so its impossible. COuld my account be hacked

ggggg

I received an "another login detected" dialog box. But then right after I was able to go back to live chess. Is my account somehow compromised?

Probably not. The usual cause is having a session open on more than one device or more than one tab.

I received  several times dialog box: another login has been detected. What should to avoid it? I have no any opened chess session on another devices

frankly speaking not several times,  but many times. It is a really serious issue. 

It also counts additional tabs or windows open in Live on the same device.

You can't open multiple tabs to Live Chess without it doing that.