It's important to keep in mind how these decisions are made. The panel of people who interviewed you each give feedback and that feedback is aggregated togethe

It's important to keep in mind how these decisions are made. The panel of people who interviewed you each give feedback and that feedback is aggregated together by the hiring manager (and possibly other leadership) to make a decision. If there is consensus in the group (in either direction) that decision is easy. If the group is split but nobody has very strong opinions, probably it will be an easy decline. If however, there is a strong difference of opinion: some folks advocating for you and others against, then they might want another round to focus specifically on the points of contention. Also, as others have pointed out, it's not clear what a "round" means to you. Where I work, we typically have two rounds: Screening (typically 2 meetings), and full panel (6-8 meetings). Before Covid, the full panel round was done in-person in a single day. Now it might be spread out, but it's still one round. Meetings between the candidate and the recruiter don't count as a round.