[2020] BUG : I can't shoot or scope with any weapon in creative

I've been trying for the pas two day to play Fortnite creative maps with my friends, but always face the issue that I'm unable to use any weapon. I can neither shoot, nor scope any weapon, yet can still build.

For some reason I can shoot if I build some sort of wall, or anything, then switch back to my weapon while my left click is still held. I can also use a controller and this has no issues whatsoever... This can only be solved by me restarting my game.

Specs and other infos :

• Windows 10 x64 1903 - 18362.592
• Keyboard : SteelSeries Apex 100 / Mouse : SteelSeries Rival 110

If you have any solution to this problem please let me know, as I'd really like to play with my friends, and not just watch...