iMac wireless keyboard alphanumeric keys locked. Help?

[modus]

I'm typing this using a mini on-screen keyboard I found in my bluetooth settings. All of the alphanumeric keys on my iMac wireless keyboard, as well as other keys like the Return key are all locked. The keyboard is on, it's connected, and I can use all of the Shift/Tab/Option/Command/and Fseries keys just fine.

Is there a way to lock/unlock your alphanumeric keys, like a NUMlock command or something? I'd really like to be able to turn this off. Thanks.