Adobe Pro script not working after duplicating to populate in multiple areas in consecutive order

Hello, So I use script: 
var date = util.scand("mm/dd/yyyy", event.value);
if(event.value == "")
this.getField("Text20").value = "";
else {
date.setDate(date.getDate() +7);
this.getField("Text20").value = util.printd("mm/dd/yyyy", date);}

to count out a week from a certain date. I have thirteen boxes with this code so that each box will consecutively display the next date that is 7 days out from the box that is in line before it. I am running into an issue after about 6 boxes. The date stops displaying after the sixth box. When I go to clear the starting week, the weeks in the 7th box finally shows up, but only displays the 7th, 8th, and 9th box. When I clear the data from these boxes, the remaining boxes display the correct dates. Im not sure what I can do to fix this. 

Also, would anyone know how to write a script that will display a specific day for a given week. For example: If the original starting week is week ending 5/11/24, could i get boxes to display the dates for monday, tuesday, wednesday, etc in designated boxes? 

Thank you