Broken vertexes on Alembic Skeletal meshes

Hi everyone;
This is my first post here , i met with this great platform 2 months ago and now rendering animated cartoon series with it.
everything is OK but im having trouble sometimes with alembic animation datas.
I’m exporting my animated meshes as alembic files in importing them as skeletal meshes in Unreal Engine.
but in some shots , some vertexes moves away for 1 frame. (you can see it on attachment)

for example , an object works fine more that 50 shots but it starts happening in 51th shot and nothing solves it.
I use 3ds max for animation.

why is this happens?

Best Regards