When a Table continues on the next page only the Table side borders will be continued until the bottom of the page. The inner borders are cell/TextBox borders and will not be continued. If you remove Table borders and rely only on cell/TextBox borders also the outer vertical borders will finish with the Table content and will not continue down to the footer. From the screenshot I suspect that this is the case.
Depending on the exact report layout there may be a workaround. For example, if you know a-priory how many rows will the Table generate on a single page, you may use Conditional Formatting
to set bottom borders only for cells/TextBoxes that are at the bottom of the page.
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