Suspected wrong first_seen on relays

Note: I've read through an existing issue for relays' first_seen and it seems to be distinct. Correct me if I'm wrong

I just queried onionoo with that:

https://onionoo.torproject.org/details?type=relay&first_seen_days=5500-

and got the attached file. It contains really few relays (expected) with identical first_seen (weird) and it doesn't even seem to be some sort of cap - tor26 suffered from Debian OpenSSL PRNG, rotated keys at 2008 and can't have an identity from 2007-10-27 12:00:00.