Save credentials dialogs in browsers

In my Chromium browser(same on chrome) inder kubuntu 18.04 saving login/password for some site I see 2 dialogs :

That is clear with right one as I use last pass
But what is left dialog? In which way can I export/import all credentials from it reinstalling my OS ?

Also using last pass and reinstalling my OS and installing lastpass access it seems to me that I haVE lost some of my credentials…

Can it be that lastpass do not save all credentials ?