This has been a thing for ever and ever - I literally don't even look at the vendor's figures when buying antibodies/ELISAs/etc because they cannot be trusted. We rely entirely on word of mouth recommendations and (costly) in-lab optimisation/validation, and kind of just accept this behaviour as normal. I would save a heap of time and money if someone could please sort this out 😅
Surprised to discover that Thermo Fisher appears to show a fake western blot for the validation of one of their p53 antibodies. I've added a diagram to show the very similar bands. This does not appear to be one of the "published figures", but their own internal data.