There can be multiple reasons to not show the request details in inspection view. Please try below options and let me know, if you still have an issue.
1) Please increased the buffer size for the the request event details by setting the property below in the local.properties file and restart the components.
2) If quite option for steps in vsm has checked, uncheck the quite option from the steps in VSM and redeploy the service.
3) If logging level has set to ERROR mode in logging.properties file, please change it to INFO mode.