Why is the weeping meringue a common issue in baking and how can it be prevented?

The weeping meringue occurs when moisture forms on top of the meringue, causing it to look wet or droopy. This can happen due to overbeating the egg whites or not baking the meringue long enough. To prevent this issue, make sure to beat the egg whites just until stiff peaks form, and bake the meringue until it is set and lightly browned. Additionally, avoid making meringue on a humid day, as moisture in the air can also contribute to the problem.