When you use the custom field, then click save, but the data unable been saved
Since you are using custom field, so you need check on edit.php
Example file location:
Click inside, then search the name of the custom field
The custom field maybe got two or more, then you keep searching will found there got one more input called 'your_custom_field' with type hidden
This make ur field unable to save, because it will replace ur value with empty value
Solution:
Hide this input
Now, when u click save, the data will able to save already.
