Not sure if this is the right category but here it is anyway:
On the server, the attachments and hinge (motor) have no issue being in the correct place, however on my client, the attachments seem to be lagging behind. The main part is being moved with cframes while the rest are unanchored and welded, including the parts where the attachment is. Re-parenting it to the anchored part does not change the result.
Here is a video explaining what I mean: