I’ve found a solution for a Marvelous Designer to Unreal MetaHuman alembic cache. Mine were offsetting in the sequencer when imported too (I even checked in Blender and it seemed alright in Blender too so I knew it had to do with Unreal 5.2)
This dude is a life-saver, works great! - https://youtu.be/gH_kExD4fFM?si=I7zInQuwATZqP-0N
Maybe it can help understanding with other software alembics too as the post-process on the MetaHuman needs to be applied to the character before exporting as he shows here in the tutorial
Also its super important that you match your framerate in EVERYTHING