Why the SQL query retuning only id numbers.? Other fields are null in personmodel(id, first_name, last_name, email, phone_number)

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C#

SQL

public List<personmodel> GetPerson_All()
{
List<personmodel> output ;

using (IDbConnection connection = new System.Data.SqlClient.SqlConnection(GlobalConfig.CnnString("Tournaments")))
{
  output = connection.Query<personmodel>("dbo.spPeopleNew_GetAll").ToList();
}
return output;
}

What I have tried:

When I try to debug the project, I realized that the output has 5 items, which is true according to my sample data. I have 5 people in the DB. But it only returns the Id field correctly. And null for other fields.
I can't figure out why. The stored procedure code is below and it works fine at the ms sql side when I exec it separately.

ALTER PROCEDURE [dbo].[spPeopleNew_GetAll]
AS
SET NOCOUNT ON
    -- Insert statements for procedure here
	SELECT *
	from dbo.tblPeopleNew