[tor-relays] why are some exit IPs missing from Exit IP DB?

[starlight.2015q3 at binnacle.cx]

Occasionally I run into a relay such as

Bywadu 5A0DE94C95E2276B4BAC974A7D8FC6463C4FE8A4

OR ip 178.33.157.6

exit ip 31.7.58.37

Where the egress/exit IP source address is
not found in the Exit DB, shows up negative
on ExoneraTor.  TorCheck in glaring unhappy RED
spits

>Something Went Wrong!
>Tor is not working in this browser.
>For assistance, please contact help at rt.torproject.org.

Does anyone know why this happens?  Many
exit nodes have ips that differ from the
OR ip and work fine.  Don't see any
bug reports on it.

Does the operator have to submit these
manually?  I had the impression that
TorCheck actually build the DB for
ExoneraTor.