Ahh, I misunderstood the first post, thought the image was moving inboard to outboard which seemed very weird indeed.. But head to tail movement is pretty normal - not however, to the extent you're getting it.
Worn registration assembly definitely. Check to see if any loose screws or missing springs also - if someone clears a jam heavy-handedly it can damage the assembly. I had to fix mine with a hammer once, metal all bent outta shape.
'Registration' is done by stalling the sheet and timing on these machines so is not what you'd call stellar, but it kinda gets the job done.
Get a call out on the machine and get the tech to look at that part. Has "2a" written on it, you'll see it on the left when you open the fuser drawer.
Short term you can try cleaning the rollers on the assembly, might help a bit.
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