Thank you for asking this question in the support community.
It is difficult to determine the configuration by the screenshot above, but did you enable it on specific interfaces? The screenshot shows you have enabled the serve, but the configuration still needs to know which interfaces it is enabled on. Here is the Configuring Integrated Traffic Monitoring (ITM) in AOS guide for additional reference.
Please, do not hesitate to reply to this post with additional questions. I will be happy to help in any way I can.