As someone who has been in the other side of the table , I'm totally confident that they have another candidate and are dragging until they confirm their accept

As someone who has been in the other side of the table , I'm totally confident that they have another candidate and are dragging until they confirm their acceptance or rejection . That, or there was 'something' that made them not pull the trigger with you, and they are waiting to interview more candidates. I'll suggest to keep looking elsewhere,FAST, even if you get another shitty offer, you then can send them an "ultimatum" telling them about your other shitty offer. You don't have to accept the other shitty offer.