Javascript Push is overwriting the previous elements

Question

I am trying render the plotly.js graph, For some reason though, the traces.push(this.getTrace(val, calAdjustData)) part seems to be overwriting previous data in the traces array, For every iteration it is returns single value, but finally last value is overwriting all previous values.

destArray.forEach(val=> {
       traces.push(this.getTrace(val, calAdjustData));
   });

getTrace() function is

getTrace(trace:any, data:any) {
    let appConfig: any = [];
    appConfig['TABLES'] = {
      'R_FORMAT': ',d',
      'MONTH_BEGIN_DATE_KEY': 'MONTH_BEGIN_DT',
      'CAST_KEYS': [
        'DOLLARS_ACTUAL', 'DOLLARS_FORECAST', 'DOLLARS_CALC_FORECAST',
        'PY_DOLLARS_ACTUAL', 'PY_DOLLARS_FORECAST', 'PY_DOLLARS_CALC_FORECAST',
        'DOLLARS_SUBMITTED', 'PY_DOLLARS_SUBMITTED',
        'DOLLARS_ADJ', 'PY_DOLLARS_ADJ',
        'DOLLARS_BUDGET', 'NEWNESS_FLAG'
      ]
    };
    var traceTmpl:any = Object.assign(this.graphConfig.graphSettings.traceTmpl);
    
    if ("color" in trace) traceTmpl.line.color = trace.color;
    if ("dash" in trace) traceTmpl.line.dash = trace.dash;
    //traceTmpl.visible = "legendonly";
    if ( trace[ "legendgroup" ] ) traceTmpl.legendgroup = trace.legendgroup;

    // Compile the trace name for legened and display
    traceTmpl.name = trace.label.replace("{type}",  this.graphConfig.display.typeLabelMap[this.displaySettings.type]);
    traceTmpl.label = trace.label;
    if (!(localStorage['legendItems'] =='')) {
        let tempArray = JSON.parse(localStorage['legendItems']).filter((x:any)=>x.name.replace("{type}",this.graphConfig.display.typeLabelMap[this.displaySettings.type]) == traceTmpl.name);
        if(tempArray && tempArray.length){
            traceTmpl.visible = "legendonly" 
        }

    }

    // Compile the field name to pluck out of the data array
    var field = trace.field.replace("{cal}", this.displaySettings.cal).replace("{type}", this.displaySettings.type);
    // Prepare the trace data
    traceTmpl.x = _.map(data, appConfig.TABLES.MONTH_BEGIN_DATE_KEY );
    traceTmpl.y = _.map(data, field);
    // todo: refactor into a function
    var tempDate = new Date();
    var currentDate = this.getDate( this.displaySettings.currentMonth || [ tempDate.getUTCFullYear(), ( tempDate.getUTCMonth() > 8 ? '':'0' ) + ( tempDate.getUTCMonth() + 1 ), '01' ].join('-') );
    if( trace.name.endsWith('actuals') ||  trace.name.endsWith('actuals_LY') ){
        var lastIdx = -1;
        traceTmpl.y.forEach( function( val:any, idx:any ) {
            if ( val !== 0 ) lastIdx = idx;
        } );

        for ( let idx = lastIdx + 1; idx < traceTmpl.y.length; ++idx ) traceTmpl.y[ idx ] = void 0;
    } else if ( trace.name.endsWith('work_plan')){
        var firstIdx = -1;
        traceTmpl.y.forEach((val : any, idx :any) => {
          var monthCheck = this.getDate( data[idx][ appConfig.TABLES.MONTH_BEGIN_DATE_KEY ] ).getMonth() > currentDate.getMonth();
          var yearCheck =  this.getDate( data[idx][ appConfig.TABLES.MONTH_BEGIN_DATE_KEY ] ).getUTCFullYear() >= currentDate.getUTCFullYear();
          if ( val !== 0 && firstIdx === -1 &&  ( ( yearCheck && monthCheck ) || this.getDate( data[idx][ appConfig.TABLES.MONTH_BEGIN_DATE_KEY ] ).getUTCFullYear() > currentDate.getUTCFullYear() ) ) {
            firstIdx = idx;
        }
      })
        if ( firstIdx !== -1 ){
            for ( let idx = 0; idx < firstIdx; ++idx ) traceTmpl.y[idx] = void 0;
        }
        if ( firstIdx > 0 && trace.altField ){
            var altField = trace.altField.replace("{cal}", this.displaySettings.cal).replace("{type}", this.displaySettings.type);
            traceTmpl.y[ firstIdx - 1 ] = data[ firstIdx - 1 ][ altField ];
        }
    } else if ( trace.name == "inventory.forecast" ){
        traceTmpl.y.forEach( function ( val:any, idx:any, array:any ) {
            if ( val ){
                array[ idx ] = val > 0 ? val:0;
            }
        } );
    }
    //convert to K dollars as plotly doesn't support that format

    //Convert from string to numbers (temporary as DB2 returning strings for some reason) and then convert to K dollars or Units
    var denominator = 1000; // K Dollars
    if (this.displaySettings.type === "UNITS") denominator = 1;
    for (let i in traceTmpl.y) traceTmpl.y[i] = ((+traceTmpl.y[i]) / denominator);

    var formatter = d3.format( ( this.displaySettings.type === "DOLLARS" ? '$':'' ) + appConfig.TABLES.R_FORMAT );
    traceTmpl.text = traceTmpl.y.map( function ( d:any ){
        
    } );
    traceTmpl.text = traceTmpl.y.map((d : any) => {
      if ( d || d === 0 ){
       return formatter( Math.ceil( d ) );
      }else{
        return undefined;
      }
   });

    return traceTmpl;
};

Please suggest any solution for this issue, already few similar questions here, but nothing worked for me.