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

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@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.