mbufs?

[Putinas Piliponis]

Hi guys,
I have found a little weird stats running on 5.3-RELEASE

4294778226 mbufs in use
4294961067/9024 mbuf clusters in use (current/max)
0/5/2512 sfbufs in use (current/peak/max)
4134578 KBytes allocated to network
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
198580 calls to protocol drain routines

and 413Mb allocated to network ? I don't even have that much memory.
How can I debug this thing ?