Calls within Gatling report not matching the number of API calls on the backend

Hi, I am facing a weird issues where my test is working fine and as per report, we are getting 180k calls within an hour. But when one of my DB checked at their end, they could see only 178500 calls being made, so we are basically missing 15000 calls right there. We are not able to identify if the issue with tool or something else. Has anyone faced a similar issue. Any inputs would be highly appreciated!