Missing end form submission popup

[Puma173]

Good evening everyone.

I'm experimenting a singular issue. Only on one list, after the form submission, no popup (as the attached one) is displayed (but the data are stored in the database).
Where I'm wrong?

Tks in advance everyone should help me.

 

[juuser]

Does this list has "Ajaxify" enabled in list settings (List -> Naviagtion -> Ajaxify)? And other lists, where the message appears, have Ajaxify disabled?