Because there were few Democrats running and lots of GOP and independents that were GOP aligned..
A lot of Democrats owe their state and federal positions to the Jungle Primary, whether they and the party, want to admit it or not.
It's a matter of Party Discipline at this point, and I'm seeing way too many otherwise good Democratic Candidates not checking their egos and ambitions and spending too much time in their localized political bubbles (looking at you, Schiff...) rather than making the occasional State tour - even to Libertarian hotbeds like Reading, Temecula, or Hemet - and talking to the public about opportunities and health care.
We should only be looking at two Candidates each seriously running by this time for the Governor, Lt. Governor, and open Senate Seat, instead of five running for Governor. We will end up with a Republican Tech Bro governor if we don't have a serious talk with all our Candidates.
Who has a better chance over the GOP and Libertarian types?

the rethugs in our state.

After the first debate, Democrats better consolidate around ONE candidate or there is a better than even chance we will have a maga governor, which will be a catastrophe, especially at this time.

Drop out so this doesn't happen.