Its possible some wires got crossed behind scenes, some database/software mixup.
Maybe email proton support if you’re concerned? I’ve had some similar mixup happen with banking and they got it all sorted after I complained (I was getting emails intended for someone else).
Edit: either way, I think you should let them know in case its phishing or something broken on their end.
touches every laptop screen, tv, monitor… “the touch screen is broken” “what’s a keyboard and mouse?”