In Content Examples, the morph targets assigned to SK_Box_Morph_1 exceed 1.0. While it's not "wrong" for morphs to go beyond that, it doesn't seem like it's a great demonstration in the asset. Going above 1.0 results in the sphere getting a little distorted.
As the animation plays, you can see the "B" curve (which is controlling the morphtarget) go above 1.0, which causes the vertices to bend inward.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-47038 in the post.
|Component||Docs - Samples|
|Affects Versions||4.16, 4.17|
|Created||Jul 10, 2017|
|Resolved||Jul 10, 2017|
|Updated||Apr 27, 2018|