Question about postman mock server - GET API call resource

Hi Team,
My question is regarding the Postman mock api server which we have setu for our Stack. There is a GET /config API resource configured to be consumed by Frontend applications. We modify the values in the Postman resource to TEST the behaviour of the application with different cases. Usually all API request would be done by disabling the Cache-Control option in dev tools for local development work, all good till here.

Now the problem, what we have observed is when the “Disable Cache” option in dev tools is unchecked which means “Cache is Enabled” and if we modify the response object in postman and save it, how many API requests we do from frontend the mock server still serves the old response before the modification was done. It only changes when we enable the “Disable cache” option. Can someone help me in understanding what is happening in the backend here ?