Why are there 2 onion versions of nightlies.tbb.torproject.org/tor-browser-builds/

Why are there 2 onion versions of https://nightlies.tbb.torproject.org/tor-browser-builds/ is one of the onions fake?

http://f4amtbsowhix7rrf.onion/tor-browser-builds/ http://5trpk2y4xzwmxznp.onion/tor-browser-builds/

Trac:
Username: Dbryrtfbcbhgf