R61 shows a total of all eCards sent through the platform, including scheduled eCards and eCards that have been hidden from the website after being in use for a period of time.
If the numbers in the two reports are not matching, the most likely reason is that R62 was generated with the Hidden eCards filter turned off. Generating R62 again with the Hidden eCards filter enabled should lead to a report with the same number of eCards displayed in R61.