https://www.pcgamer.com/fortnites-guided-missiles-turn-faster-at-higher-framerates-apparently/

Fortnite has had its fair share of bizarre bugs since it launched last September, and the latest is linked to guided missiles, which were reinstated this week after a heavy nerf from Epic. Players have discovered that a missile's turning speed is directly linked to their framerate: the more frames you're getting, the faster the missile will turn.

The bug was first pointed out by Reddit user SwordofFlames, who uploaded a video as proof, part of which you can watch above. You can see that the missile turns much quicker at 120 fps than 60 fps.