Calendar showing just at second click

[dcuder]

Hi, I have a problem with primeng 7.0.3 calendar module.
I have two calendars input in the same form, a simple date-from date-to.
When I click on one of them, the popup calendar appears and instantly disappears.
It is correctly shown just at second click. If I click outside and then in again, the behavior is randomly correct or wrong.
Here's my code:

Code: Select all

<div class="col col-3 margin-top-1">
      <label>Data Apertura</label>
      <div class="ui-inputgroup">
        <span class="ui-inputgroup-addon"><i class="fa fa-calendar"></i></span>
        <p-calendar [(ngModel)]="ticket.dataApertura"
                    showTime="true"
                    hourFormat="24"
                    dateFormat="dd-mm-yy"
                    [locale]="itIT"
                    (ngModelChange) = "aggiornaOraChiusura(sla, 0)"
                    name="dataApertura"></p-calendar>
      </div>
    </div>
    <div class="col col-3 margin-top-1">
      <label>Data Prevista Chiusura</label>
      <div class="ui-inputgroup">
        <span class="ui-inputgroup-addon"><i class="fa fa-calendar"></i></span>
        <p-calendar [(ngModel)]="ticket.dataPrevChiusura"
                    showTime="true"
                    hourFormat="24"
                    dateFormat="dd-mm-yy"
                    [minDate]="minDate(ticket.dataApertura)"
                    (ngModelChange)="checkMinDate(ticket.dataApertura)"
                    [locale]="itIT"
                    name="dataPrevChiusura"></p-calendar>
      </div>
    </div>