Pop-Up "Close" & "Cancel" Buttons disappear after Cancel Submit

Pop-Up "Close" & "Cancel" Buttons disappear after Cancel Submit

I have a Pop-Up Form.

In the validation workflow, I have a Cancel Submit for when I client doesn't submit the correct information on a SubForm.

The Alert and Cancel Submit return to the Pop-Up correctly. If I hit the "+ Add New" to add a new row, the "Submit" and "Cancel" buttons disappear. There's no way to close the Pop-Up form without pressing the "X" in the upper right-hand corner of the Pop-Up.

Thanks