After update, former refund orders were emailed again

Hi, I was upgrading from Woocommerce 2.3.11 to 3.65. Quite a jump and it was very stressful during testing. One odd thing I didn’t notice until my client told me was that there were customers pointing out that they received a refund email… even though their refunds were years ago. So I look at the monthly report, and it shows that the refund amounts are affecting the current month’s sales. When I look at the report, it literally shows me this:

$1,995.52
refunded 12 orders (0 items)

Also to note is that I do have about 4 other Woocommerce related plugins.

Anyway, does anyone know why this is happening?