[Pki-devel] Sub ca shows s # 2 at end

Dear, I have installed a root CA, then installed a sub CA signed by that root CA (all are dogtag 10.5). When i export the certificate for the user, it shows a "# 2" at the end of the sub CA certificate path (screenshot attached) . I did not include in my configuration. Where does it come from and how can I remove that.  Thank you..