Missing notification node when user starts to use tab for the first time

I have a UI where I need to fill these fields in order to add a new instrument in my sql database.


For most of the field there is a check: in case of some empty field or CODIFICA already present in the database, a pop-up is given (by notification node).
Now, when I enter in this tab for the first time, and I partially fill the fields, no pop-up is shown and data are not saved. Instead, if (when I enter for the first time) I correctly fill all the fields, save data by clicking on the button and then I try to add another instrument, in this case I get the pop-up if some field are not filled.
So, it can happen:
CASE 1:
Enter for the first time on the tab;
fill partially the fields,
click on the button to save
--> no pop-up alert shown and data are not saved (no saving action is done but no information is given to user)
CASE 2:
Enter for the first time on the tab;
fill all the fields,
click on the button to save
--> data are stored
try to insert new data (for another instrument to be saved)
fill partially the fields,
click on the button to save
--> pop-up with alert of missing field is given.

Do you have idea why this happens?
I don't know how to solve it.

Maybe another option is to disable the button until all the fields are not filled, but I don't know how to do and I have alredy generate the flow for the option I reported here

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