Sometimes when I visit the stack overflow site, its shows the "interesting" Tab, but sometimes it shows the "Questions-->newest" Tab. Why is it navigation not always the same? Is it a bug?
interesting tab and the
questions -> newest tab are two different URLs:
Interesting is the default page for https://stackoverflow.com/
Questions -> Newest is the default for https://stackoverflow.com/questions
Both URLs can show you a different tab next time you visit, too, as SO remembers what tab on that URL you last visited. For example, the homepage has
month tabs too, and question pages have
unanswered flavours available.
Double-check your browser location, perhaps your browser auto-completed to the
/questions URL for you.