This issue is likely caused by CSS styling or JavaScript code interfering with the dropdown's display. Without seeing the specific code, it is difficult to determine the root cause of the problem. However, some common causes include:
- Overlapping elements or containers that are hiding the dropdown
- Setting the display property to none or hidden
- Incorrect positioning or z-index values
To resolve the issue, you may want to inspect the elements involved in the dropdown display and see if any of the above causes are present. You may also want to try to isolate the issue by disabling styles or scripts and testing the dropdown again to see if the issue is resolved.