From the description and the provided screenshots, I assume that in the report there is a rectangular Shape that is overlapping with the TextBoxes. Please, note that in Excel rendering overlapping items are not supported and will be moved down/right by the Excel renderer so that they do not overlap - Design Considerations for Excel Rendering.
I suggest replacing the Shape with a Panel with the same size and set borders to this Panel. Then you may place the TextBoxes inside the Panel and they should be rendered as expected in Excel.
Please, test and let us know whether this works for you.
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