datagrid does not change fontsize on some rows

* .NET Core Version: 2.1.509
* Windows version: 10
* Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes/No

**Problem description:**
When i change the fontSize from code and save it in Settings some rows are not changing the size

```
Properties.Settings.Default.FontSizeALimpiar` -= 2;
Properties.Settings.Default.Save();
```
```

<Setter Property="HorizontalAlignment" Value="Center" />

```