Ninja sending payment confirmation email when it shouldn't

I can’t seem to get invoice ninja to enter a payment without sending a confirmation email. There’s times I don’t need to send one (like when someone hands me a check) but even when I manually enter a payment and unselect the “send email” button, it sends one anyway. Any ideas?

Have a look at
Settings → Company Details → Defaults → Manual Payment Email
Settings → Company Details → Defaults → Online Payment Email

for an explanation of those settings.