the original (blue) has follow-through and also specifically truncates the use of overlapping action to soften the effect. i.e. it backloads the motion and makes sure all ‘impact’ is in frame 1 and the remaining time on screen is pure resolution.
this could be due to video capture (because this is a flip book? the slow mo version makes it noticeable more-so), but let me show you screen shots that I think illustrate what is hurting your effects motion in terms of it being jarring
1a
2a
the bright glow for frame 1 is ‘too small’ i.e. does not delineate the area of effect instantly and also holds size for 2 frame captures.
too much overlapping, the orange mesh element also beings too small; this makes the entire initial impact spend 3 frames ‘too small’, then it expands to nearly the full size but lacks as much follow through. so this becomes very harshly stair-stepping in terms of the motion
3a 
lacks follow through of contrasting VFX that connect the spell to environment
1b 
2b 
notice
- area clearly defines perimeter with blue on frame 1
- blue holds near this position with some shrink, then expansion; it is a small amount of double-burst feel
- dust /environmental perturbation with desaturated VFX; almost no overlapping action but a lot of follow-through to soften the motion that your eye would expect.
value analysis
for their spell the dust follow through is pale medium yellow to contrast blue, while purple in your effect has a lot of chroma; This seems connected with your spells primary energy rather than a contrast and becomes a polar color selection
hope this helps because these demonstrations of re-creation are a great way to build out portfolio for jobs