CSRF TOKEN INVALID RESPONSE

Hi,

In few of our publisher nodes, we are getting response of CSRF token as below for unauthorized users.

Ideally response should  be null and it should load from server. But in our case CSRF response is loading from Browser disc cache and other post calls are failing.

{"jcr:primaryType":"nt:unstructured","jcr:mixinTypes":["rep:AccessControllable"],"sling:resourceType":"granite/csrf/token"}

Any idea?