trouble with link

Before when i Clicked on a link  on my list, Workflowy opened automatically a new tab. But now (since 2 or 3 days) it opens  a new tab and it replaces my current worflowy page with the same opend page !!.. like 2 new pages opened but workflowy closed. It's very annoying.. I have to make click right to have what i want... (I havent' change anything in my browser which could explian this bug)