Morph animations are twitching?

Hello everyone,

I’m currently trying to animate a blooming flower, which I made in Blender. I made some Morph targets which actually work like they are supposed to, at least in the preview.
But when I setup a Blueprint to animate my morph targets they somehow twitch at the end positions. I recorded the problem to show you what happens.

(Flower is still in development)

I hope someone can help me to fix this.
Thanks in advance.