Thank you for reply @Fagani
unfortunately based on information from your reply, I am having a difficulty to understand what the issue could be. If I were in your situation, my starting point would be looking into URL logs. The first thing I would make sure that all allowed URL categories have action set to alert. Alert action allows traffic and records the logs. Also for the policies that are getting hit by this traffic, I would check in the traffic logs for "byte received" to confirm there is a response from web server.
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