This is a totally normal situation. The plane can make a second circle for various reasons. For example, there might be an object or an animal on the runway, there might be a very strong side wind, or the airport might be temporarily closed for the urgent landing of a different plane.

Passengers get very worried because, before the long-awaited landing, the plane suddenly starts gaining altitude. But actually, everything is under control, and this is a standard way of making another circle.