I was doing some further digging into this and I think it’s because some of the caucuses were “non-binding”. Iowa, for example. So the delegates can (and probably will) change their vote as the process moves forward. The various news agencies are making predictive guesses for these non-bound delegates.
If it works like it did in WA state – the one time I participated in a caucus… The individual caucus elects delegates to the county… then at the county those delegates vote again – and that allots delegates to the state convention… and the state convention delegates vote in delegates to the national party convention.
In my case, in 1992, I was elected to be a Paul Tsongas delegate from my precinct – but Tsongas had dropped out of the race by the time the county convention happened – so I shifted my vote to the inevitable winner – Clinton. That was the last dem. caucus in WA state, by the way.
Both caucuses on Tuesday night were NON-binding. And MO didn’t count at all – their real primary will be next month.