What I've done:
One password was duplicated under general and emails groups, so I've selected it in the vault grid view,choose the action [exclude] from the top drop-down menu and at the question «Exclude this site – account.login.etc?» I've answered [Yes]. My mistake. I thought it would just delete that record, but no, all my passwords stored for several accounts account.login.etc were vanished.
Is there an undo option or a trash group from where I can restore those accounts passwords?
Thanks for reading.