C# WPF strange checkbox behaviour in datagrid

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WPF

checkbox

DataGrid

behaviors

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I have created a Datagrid with 3 columns. One of the columns is a Checkbox. The checkbox is used to select the item in the Datagrid.

I have used the XAML code below to create the datagrid. There is no Code behind which interacts about checkin the checkbox. However, when i check checkboxes and i scroll down. Some of the Checkboxes i never checked become checked. Also, the checkboxes i checked randomly stay checked or uncheck. I have filmed the problem and uploaded it to youtube. You can find the link below. I have added subtitles to explain what is happening.

Anyone have a clue on why this keeps happening and how to stop it?

<DataGrid x:Name="Lbox" CanUserDeleteRows="False" Margin="10,86,519.333,-0.333"
                        ItemsSource="{Binding Items}" CanUserAddRows="false" AutoGenerateColumns="False">
                        <DataGrid.Columns>
                            <DataGridTemplateColumn Header="DUT">
                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <CheckBox x:Name="checkboxinstance"/>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>
                            </DataGridTemplateColumn>
                            <DataGridTextColumn Binding="{Binding DraadNr}" Header="DraadNr" IsReadOnly="True"/>
                            <DataGridTextColumn Binding="{Binding Naam}" Header="Draadlijst" IsReadOnly="True" />
                        </DataGrid.Columns>
                    </DataGrid>

YouTube[^]

What I have tried:

I have googled the problem, but i could not find a problem which is nearly the same as mine.