Hello Kirstenwestberg,
It might be a compatibility issue with EASY ANTI-CHEAT.
Please try Bandicam 4.5.4 from
https://www.filehorse.com/download-bandicam/46281/ and try again.
If you don't have the issue with Bandicam 4.5.4, please contact the Fortnite development team and let them know the compatibility issue with EASY ANTI-CHEAT and Bandicam.
Thank you.