Clip with a lot of keyframes can't be moved with mouse on timeline.
If i add to clip a keyframmable effect (in this case 2 effects... but can be just 1 effect and the keyframes taken from another clip) and i fill the effect with a lot of keyframes (like this case) is not possible to GRAB the clip on timeline to move it left-right/up-down because the mouse pointer always grab a keyframe and the clip.
i think that if the number of keyframes is more than 3 keyframes per second and the entire clip orizontal size is lower than the kdenlive x-size is better to force mouse to not grab keyframes, but just the clip
video of the issue: BstYGhJwn3