cannot select my ngui-auto-complete scrollbar

Everytime I select the ngui-auto-complete scrollbar on the dropdown component, the dropdown disappears.

Would it be a better idea to add my scrollbar to another element rather than ngui-auto-complete?

Working example: STACKBLITZ

dropdown.component.html

<form [formGroup]="myForm" class="form-style">
  <input
    id="input-dropdown"
    [list-formatter]="autocompleListFormatter"
    type="text"
    class="form-control"
    minlength="3"
    maxlength="20"
    ngui-auto-complete
    formControlName="gridDropdown"
    [source]="dropdownData"
    value-property-name="id"
    display-property-name="name"
    placeholder=" Search"
    [(ngModel)]="value"
    #agInput
  />
</form>

Source_code

from cannot select my ngui-auto-complete scrollbar