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.
For anyone wanting to try inverted recipes, I recommend getting the pressure valve instead of inverting.
You don’t need the literal balancing act or risk spilling hot coffee sludge everywhere.
Edit: or the fellow prismo like OP mentioned, its the same function.