I have figured out that our document library columns have duplicate columns. We are using the content type. When I'm going to compare this duplicate column name, it is showing like below with extra "0".
It's strange why this duplicate column happen. All the information entered to this column can see on the list but cannot get on the item edit/view.
When we implemented this library was only one column for each field. How should I return back to the original state without losing information on each documents.
Looking forward to see solution, if anyone has similar issue. Thanks All.