How to properly process JSON?

Question

JavaScript

Good day.
In general, there is a JSON response from the PHP server.
I get AJaxom response processing Php script.
JS does not give the entire amount of data
The script itself.

$.ajax({

 url: 'url',
 type: 'POST',
        dataType: 'json',
        cache: false,
        data: obj,

      })

      .success(function(data) {
        
        // var dataDecode = JSON.parse(data);
        console.log(data);
        var dataObj = data.doctors[0].day;

        let arrayLength = dataObj.length;

        let getWeek = dataObj.length / 7;
        let getweekNum =  Math.floor(getWeek);

        console.log(data.doctors[0]);

Red indicates the actual number of elements in the array, but the value in the object is different.
In network -> XHR - preview Everything is clear, as it should be 11 elements in the array.
but actually less.
It does not matter the actual number of emails received from the server.
In the end, some of them still disappear.
Here is the console outputting DATA

A Here is the answer from the browser's point of view.

THANK YOU FOR YOUR ATTENTION!