The circular diagram is a great way to represent percentages about a specific set of descriptive data. In this case, we have 4 types of wedges. However, the diagram itself doesn't provide the percentages, that's why if we don't have the percentages, the graph would mislead to the wrong analysis because the sizes of the wedges are not specified without the percentages.
Therefore, the most potential misleading feature is the size of the wedges.