C and F keybind not working right

Summary

I’m having a consistent issue in Fortnite where the C and F keys occasionally don’t register when pressed, especially during fast building or editing. Every other key works perfectly.

I’ve tested this with two completely different keyboards (Aula F60HE magnetic and Aula F75 Pro mechanical), and both have the same problem only with C and F inside Fortnite. Outside the game — in key testers or other apps — the keys work flawlessly.

I’ve already:

Reset all keybinds and config files,

Cleared old keyboard drivers,

Tried wired mode, different USB ports, and different polling rates (125–1000 Hz),

Verified all keys register consistently in Windows.

It seems Fortnite’s input system is ignoring or dropping simultaneous C + F presses. Is this a known issue or fix for this?

Please select what you are reporting on:

Creative

What Type of Bug are you experiencing?

Character

Steps to Reproduce

I load into any map or gamemode
i try to build
walls and stairs and floor and roof works well
then when i have to build roof and floor at the same
thats when it starts
sometimes they place at the same time
other times only the roof or floor places

Expected Result

I expect for both floor and roof to place like usual

Observed Result

When I press C and F in other games or apps they work well but when it comes to Fortnite its a problem

Platform(s)

pc

Video