Data not showing in

I have problem displaying data in datatable.

I've tested the code with some alerts just to see if I was correctly mapping fieldName:value for the table and it is correct, but for some reason it isn't showing.

Columns for datatable are dynamic - based on multiselect picklist, and the data should be mapped appropriately for each column. The data I get from my Apex API call is List and it looks like this -->

I've made some alerts just to see if I was getting individual rows in the data and it looks like this -->

Lastly, I've made an alert to see if the fieldName and the value are mapping correctly, looks like this -->

etc.... Based on how many columns the user has selected

The for loop for filling the datatable is this (the first for loop is 0-100 because the server always returns 100 rows, second loop is based on all selected columns from user):

if(state === "SUCCESS") {                    var responseData = response.getReturnValue();                    //var jsonString = JSON.parse(JSON.stringify(responseData));                    alert(responseData);                    // used for getting the size of an List of all columns for the loop                    var columnsList = component.get("v.columns");                    var data=[];                    // data for dataTable                    for(var i=0;i<100;i++){                        var row = responseData[i];                        alert(row);                        for(var j=0;j<columnsList.length;j++){                            var column = columnsList[j].fieldName;                            alert(column +" " + row[j]);                            data.push({column:"row[j]"});                        }                     }                    component.set("v.dataTableData", data);                }

What am I doing wrong?

EDIT 1 --> console.log:

EDIT 2 --> console.log(columnList);

EDIT 3 --> TypeError: Cannot read properties of undefined (reading 'forEach')

I've noticed that API returns the same column 4 times (session_id,visitor_id,timestamp,session_unique_content_impressions x4)..

NOTE: This is Dummy data, there's no privacy concerns.