Honestly it seems like a fine solution on both sides.
“You have secured yourself an honored platform and you interact with it. Please buy me my own honored platform, so that we may remain as equals in the matter of the computer. Thank you for your attention to this matter.”
First possibility that comes to mind is a backed up federation queue on lemmy.world for some reason.
It could also be some failure on sh.itjust.works, but if I had to guess I would say it’s more likely an issue on the sending end.