This issue is environment specific and not reproducible by Esri staff using Workflow Manager Desktop/Server 10.8.1, Workflow Manager Desktop 10.8.1, or Workflow Manager for Server 10.9.
Additional users who experience this behavior should contact Esri Support Services for troubleshooting and an attempt to reproduce in-house.
解决办法
Use Internet Explorer instead of Google Chrome, Mozilla Firefox, or Microsoft Edge.
Use the arrow keys on a keyboard to select radio buttons instead of mouse clicks.