Why do I get wrong value when parsing data to decimal (from sqlite db)?

See more:

C#

threads

SQLite

parsing

Scenario
- encrpyted Sqlite database
- System.Data.SQlite.dll (version 1.0.97.9)
- .net framework 2.0
- x86

There is one thread for writing data to database, and several threads for reading data.
Table is created in next way:

CREATE TABLE [TableTransaction] (
  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
  [TOTALIN] DECIMAL(18, 4) DEFAULT 0
  ...
  );

Code which is used for reading data:

using (DbCommand cmd = SQLiteFactory.Instance.CreateCommand())
{
    SQLiteConnection cn = (SQLiteConnection)SQLiteFactory.Instance.CreateConnection();
    cn.ConnectionString = "Data Source=myDatabase.db; Password=fdsh243ah45";
    cn.Open();
    cmd.CommandText = "SELECT * FROM TableTransaction";
    cmd.CommandType = CommandType.Text;
    cmd.CommandTimeout = 15;
    cmd.Connection = cn;
    using (DbDataReader reader = cmd.ExecuteReader())
    {
        while (reader.Read())
        {
            int id = reader.GetInt32("ID");
            decimal totalIn = reader.GetDecimal("TOTALIN");
        }    
    }
}

In database TOTALIN = 0.0001.

If I run this SELECT command from main thread, then I get totalIn = 0.00100000011920928 (wrong value).

But, if I run it from some other thread, then totalIn = 0.0001 (this value is ok).

I assume that there is some internal casting from decimal to double. But why it happens only on main thread?

What could cause this behaviour?

I didn't play with threads, all thread values are default values.