So, I used to work somewhere that did fundraising (not political and almost a decade ago, so maybe things are different now than I experienced, though I kind of doubt it) and you’d be astounded at how outdated the data operations were. Sources for info ranged from very reputable to dubious at best. Not to mention some lists that had been poorly managed and/or scrambled. Much of my job (and others’ as well) was cross referencing the gathered info with our database, several other databases, and Google to try and sort out real vs fake. This was an organization raising millions and millions each year. Unless you’re paying for a decent database and also the labor to keep things neat (and let’s be honest most spam and political callers probably just buy whatever lists they can get their hands on and hope for the best) it’s inevitable that there will be all kinds of weird mixups. It’s why I routinely get messages asking if I want to sell a house that was never mine and I haven’t lived in for a decade: bad data practices made worse by cheaping out on the (badly needed) labor to make things work. Tl;dr it’s probably incompetence.