why menu add space as white space blank on drop down ?

Question

why menu add space as white space blank on drop down ?

I work on angular 7 i found drop down display white space on drop down so that why and how to solve that

<div class="form-group" style="display: flex; align-items: center;margin-top:10px;margin-left:20px;">
         <div *ngFor="let fil of FilterList" style="padding-bottom: 10px;margin-right: 10px;">
           {{fil.controlName | slice:3:15}}
           <Select id="{{fil.controlName}}" (change)="onChange($event)" class="form-control"
             style="width:200px; margin-right:10px;" >



             <option value="0">-Select-</option>

             <option *ngFor="let fil2 of this.FilterBinddata" >
               <div *ngIf="fil.controlName===fil2.filterName ">
                 {{fil2.reportSource}}
               </div>
             </option>




           </Select>

           <div>
           </div>

         </div>

       </div>