LLDP neighbour incorrect

I have a Dell S3048 switch. Port 17 is connected to the dedicated management interface of a Dell S5232F. Both switches ahve the same OS and LLDP enabled.

Observium shows the neighbour information for the S3048 correctly:

Ethernet1/1/17 <-> S5232F mgmt/1/1/1

However, the neighbour information for the S5232 is incorrect:

Enternet1/1/7(down) <-> S3048 1/1/17

(S5232 1/1/7 is a 100Gbe port that is not in use)

I have rebooted the S5232 and re-run discovery and poller processes on it.

Poller, discovery, and snmpwalks attached.