Would you mind giving us more details on your environment.
The LIF you are referring to: Is it NAS SVM (i.e serving NAS Protocols only: CIFS/NFS) ?
I am asking it b'cos : For SVM serving CIFS and NFS protocols only, data LIFs have management access by default. Which means, both data protocols and management protocols can share the same LIF, unless you create a dedicated LIF for management purpose.
What's ontap version?
Output of this? ::> network interface show -vserver <vserver> -fields role,firewall-policy,data-protocol