Angular PrimeNG p-confirmDialog display twice

Which is that case when the confirmation dialog displayed twice? Or with other aspect, what is the cause when a confirm dialog shown twice?

I have a simple dialog template

<p-confirmDialog icon="fa fa-exclamation-triangle"
width="444"
[closable]="false"
key="uniqueidofdialog"
appendTo="body"
#dialogref>
<p-footer>
<button id="gemini_consentLockedByAnotherUser_btnOk"
type="button"
pButton
class="button-primary"
label="OK"
(click)="dialogref.accept()"></button>
</p-footer>
</p-confirmDialog>

private showConfirmDialog() {
this.confirmationService.confirm({
message: `Warning! blah-blah.`,
header: `Warning header`,
key: 'uniqueidofdialog',
accept: () => {
// TODO
}
});
}


Of course the ComfirmationService included into the provider section of the module, and the ComfirmDialogModule is imported into the import section of the module. showConfirmDialog() called once.

What I missed?

Thank you in advance

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