why doesn't the candidate with the most votes have the most delegates?

I'm sure this has been covered on DU before, but I missed it. Right now with 67% precincts in Sanders has more votes but Buttigieg has more delegates. I don't understand.

MSNBC just said that the app was made available to the precinct captains a few day ago.

I have been a systems programmer/analyst for 30 years. My first programming job was on a 2000 pound mainframe with a 2 megabyte hard drive. I have a few questions.
Was the app tested on a large scale simulation?
Were backup systems in place in case the app failed?
Were the backup systems tested on the same large scale simulation as the app?
Was the app independently audited?
Was there formal training for the end-users?

I have worked for some of the nation's biggest banks, credit card companies, and pubic utilities. None of them would accept an answer of "no" to any of these questions.

UPDATE: According to the Huff Post, the development of the app began in this past November. The incompetence of the people in charge of the Iowa caucus is mind boggling.

Iowa gave Bloomberg a great talking point.

Bloomberg built an empire based on gathering complex financial information from around the world and reporting it instantly and accurately.

70 years later and Will Rogers is still right.

"I am not a member of any organized political party. I am a Democrat."

What time does the Iowa caucus end?

5:30 am - watching Michael Moore speech for Bernie. a very good

And effective speech. Passionate, persuasive, and entertaining.

Who would be interested in starting a ham radio group?

Florida Man strikes again.

are the 2 articles of impeachment voted on separately or together?

I know it won't happen, but maybe the Senate is more likely to convict on obstruction of Congress. Maybe the senators will be more interested in protecting their own power of oversight then they are in protecting trump. I know it's a fantasy, but just maybe....

maybe Warren was referring to the "30 years - 1990" exchange

When she told Bernie "you called me a liar". She was momentarily confused during that exchange and perhaps that's what prompted her to say what she did.