When creating and modifying MCQs in LabAuthor, why is the shape of the Answer Checkboxes appearing inconsistent?

Multiple Choice Questions (MCQs) have varying Answer Checkbox shapes depending on the type of responses you have enabled within the Properties of the MCQ:
- For MCQs that only allow a single response, the checkboxes appear circular:


- For MCQs that allow multiple responses, the checkboxes appear square: