Every time i renew an access token (via the refresh_token grant), another new refresh token is returned

Hi,

when an access token is expired, i try to get a new access token via the refresh_token grant (providing a valid refresh token), another new refresh token is returned.

is it a normal behavior? will it cause performance issue ?

thanks.

forget to mention, i use redhat sso 7.3.3, beside a new access token, another refresh token is also returned.