You probably have two (or more) typing languages/types of keyboard installed on Windows. I, for instance, have Brazilian Portuguese and Japanese on my computer, so that's there.
It shoudl also be on windows bar, by your docked applications, by the clock.
Left Shift+Left Alt will cycle through them on any focused application.
I'd say you'll have to remove the different languages/keyboard inputs that you don't use in Windows.
Weeellllll, kind of a late answer, but I just got back from the worst work day of the last couple of years.
I've checked it and, as expected, I just have Italian layout set up. I've tried adding (and enabling) the EN_US one and also forcing EN_US for everything system-wise (it was already like this, but I tried again) and nothing, I still get that tooltip.
I guess I'll have to live with it, but ugh, I really don't know what's the point of that. :/