Do you use the GridViewSelectColumn or have you defined your own custom column to handle the multiple selection? If it is the second option, then have you tried using the GridViewSelectColumn? If you have to use your custom column, then would you please share some code snippets on your logic?
You say that the problem occurs after swapping the page in and out., would you please share a little bit more details on how have you implemented the paging? Does the issue also appears if you comment all the code you execute when the "Checked" and "Unchecked" events are raised?
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