I Need Help On Flip Frames ROBLOX ANIMATION

Hello im new at animation and im also a roblox animator so i tried doing small goals like a first walk cycle and apparently when i follow a tutorial and when i do a flip keyframe it brakes on me i dont know whats causing it just look at this GIFS it works fine for other people but not me so i wanna know whats causing it or what im doing wrong? https://i.gyazo.com/be7b71435d12f4d512b19549e1a1466e.mp4 and https://i.gyazo.com/151f06d461cf04754d36c7598146db7e.mp4 please help