Hi Ernesto,
Thanks for contacting Syncfusion support.
We have analyzed your sample, and the cause for this behavior is that you have enabled PersistSelection property in Grid. This is the default behavior when enabling PersistSelection feature of Grid. Please refer the notes section of the below documentation,
Please remove the below highlighted property to overcome this behavior.
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<GridSelectionSettings CheckboxOnly="false" PersistSelection="true" CellSelectionMode="CellSelectionMode.Flow" Type="SelectionType.Multiple" />
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Please get back to us if you need further assistance.
Regards,
Renjith Singh Rajendran.