Can't focus keyboard?

Hello, I did a blueprint that you can’t lose the focus of a window, but even with that, it still can’t focus correctly. I mean that everytime I set the focus to the keyboard, it unfocus. Here is what I did: If the editable text box isn’t focused, it focus, but somehow, it make a big loop and doesn’t even focus it… Is this a bug in 4.19 or something?