C# datagridview text style ?

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C#

DataGridView

-------
No|Data
-------
1 |123
-------
2 | 1 2 3
-------

It's DataGridView displaying on C# Winform.

First record was added via HeidiSQL.
Second was added via DataGridView's new row on C# Winform.

I just want the first record style.
Can anyone tell me what makes second style and how I can fix it?

Thanks in advance.

What I have tried:

I found something but it's not solved yet.

-------
No|Data
-------
1 |123
-------
  |
-------

1. Add new row with keystroke 'abc' at second line. It looks like below.

-------
No|Data
-------
1 |123
-------
2 |ａｂｃ
-------

2. Leave row
3. Edit with same data.

-------
No|Data
-------
1 |123
-------
2 |abc
-------

4. And it goes well on other cell.

-------
No|Data
-------
1 |123
-------
2 |abc
-------
3 |def
-------

Only text key makes this. Number key doesn't.
' 1 2 3 ' -> ' 4 5 6 '

It's not a blank.

This makes me crazy.