Refunds asked outside the refund period

Hey guys, quick question for you.

I'm making some analysis regarding the refunds of our product. To my knowledge, a user is eligible to ask for a refund only within two months from the payment (may it be the first payment or the nth payment).

The problem is that I've seen refunds happening even after this refund period, for which the whole payment has been refunded (not partial). I understand that this might happen for yearly subscriptions, in these cases it happens when a user asks for a switch to a new subscription. However, I can't explain myself how this also happens for weekly subscriptions. Moreover, it also happens for users who, almost surely, haven't made any other purchases to our app after having asked for the refund, thus the refund can't be considered as a switch.

Do you have any idea on how I could interpret these refunds? Also, do you have any documents that explain more in details the regulation regarding the refunds? I couldn't find any online.

Thanks everyone!