Avoiding repeated data in laravel querybuilder result - laravel

Question

I am trying to write code to return the number of diseases diagnosed in a clinic after a given period either weekly, monthly or daily using jimmyjs laravel-report-generator using the code bellow,
$fromDate = $request->fromDate;
$toDate = $request->toDate;
$sortBy = 'updated_at';
$title = 'CHATTHE GROUP'; // Report title
$subTitle = 'Mobidity Report';
$total = 0;
$meta = [ // For displaying filters description on header
''=> $subTitle,
'From' => $fromDate . ' To: ' . $toDate,
'Generated By' => Auth::user()->name
];
$queryBuilder = Diagnosis::select(['diagnosis', 'updated_at']) // Do some querying..
->whereBetween('updated_at', [$fromDate, $toDate])
->distinct('diagnosis')
->orderBy($sortBy, 'ASC');
$columns = [ // Set Column to be displayed
'DISEASE' => 'diagnosis',
'NO OF CASES' => function($result){
return Diagnosis::where('diagnosis',$result->diagnosis)->count();
}, // if no column_name specified, this will automatically seach for snake_case of column name (will be registered_at) column from query result
'% TOTAL' => function($result){
return (Diagnosis::where('diagnosis',$result->diagnosis)->count()/$result->count()*100);
}
];
return ExcelReport::of($title, $meta, $queryBuilder, $columns)
->editColumns(['DISEASE', '% TOTAL'], [ // Mass edit column
'class' => 'right bold'
])
->showHeader(true)
->simple()
->download('mobidityReport');
This produces the following excel file
Which has the diseases repeated just as they repeat in the table, is there anyway to avoid this? I tried using distinct() but that gave an error.