The problem with this code is that whenever we input value, save the previous value. Lets understand with example, Data is present in all fields ( field1= 1 ), ( field2= 0 ) , ( field3= 4 ), When we input value in the field, the previous value in it is returned. If the ( field1= 1 ) or I did ( 1 to 10 ) so it automatically takes ( 1 ). If the ( field2= 0 ) or I did ( 0 to 5) so it automatically takes 0.
I have attached a video below for better understanding. 
Is there any solution to this problem?
If anyone knows, please help.
Thank you.