HELP! A shortcut that open other shorcuts!

I'm kind of desperate here!

So, a strange thing happens with me, and now, I don't have any idea how to fix it.

I was typing like I always do, using a USB keyboard, with External Keyboard Helper Pro, bought from Google Play. I usually type in Evernote.

In a moment, I'm kind press more than one key a the same time - problably a Fn, Ctrl or Alt and other. I have no ideia what I pressed! But since then, I CAN'T type anything, because the keys open other apps! Really, if I press "e" in the keyboard, the e-mail on my tablet open, and if I press other key, other app open. I tried figure out, search in the settings from my tablet and in the settings of EKH, but I don't have any shortcuts configured!

Please, tell me this already happened with other user, and you guys know how to fix it. I'm beg!!! I really don't know what to do, and I use EKH a lot!! I'n thinking that I press some kind of shortcut that activated other shorcuts, but I don't know how to back for what its like before!