Hi, i'm using an asus laptop and I don't usually like the feeling of the keyboards of laptops, and I plugged in my Mad Catz cyborg v7, but when I type a letter, for example, Z it types z1, or when I type 5, it types 45.
I've tried uninstalling the drivers and installing again, changing the drivers for other generic one, plug out and in and still does this thing.
Not even in my laptop, if I plug it on my ps4 it does the same, I bought this keyboard recently all new in a store, not second hand, It worked flawlessly until last week and I don't know how to solve this thing.
Since you say this happens no matter the device, I would say that either something got spilled into the keyboard or it is flawed.
If the former, you are going to have to open it up and clean it out. If the latter, and it has only be a few weeks, then I would contact either the store or the manufacturer about a replacement of the keyboard.