I've bought a keyboard the gxt 840 Myra and now if I want to do in Fortnite 90s then the H button does not work (have the bottom on H) but if I let everything go then that goes again. I do not understand that and what can I do. So in general I can't press all the buttons at the same time for what I want to do, but if I let go of all the buttons, then it goes. It works on my 10 year old keyboard
The number of simultaneous inputs is limited. For USB keyboards, it is usually 4. For more expensive keyboards are schonmal more.
Since your keyboard is more likely to belong to the budget models, there will be 4 at the end.
But the keyboard has the anti ghosting and you can press up to 8 keys at the same time
Obviously that's not the case with you. Then this anti-ghosting probably does not do what it promises.
Try it out.
http://keyboardchecker.com/
https://www.computerhope.com/issues/ch001577.htm
