InputField erratic behaviour

I have an input field in my game that doesn't work at all. If it's not enabled when the game starts I can't even focus it, mobile keyboard immediately disappears. My solution was to scale it down and up again when I need it instead of enabling/disabling it, and now the mobile keyboard stays up when i select it but every time I type it immediately deletes what I type. Could it have anything to do with the fact that I have two cameras and the canvas is in the one that's rendered before the other one? If so why does this happen?