Same time of day?
Maybe time to talk to the neighbors to keep an eye out too. That there's been somebody on your porch, and theirs going after your cat.
It could innocently-ish be someone in mental decline, who can't have pets, lost a cat, who knows, wandering around on a daily walk. But it would be one thing for a known good neighbor to be friendly with your cat, it is quite another for a stranger with health issues to come onto your porch and approach your cat two days in a row. You don't want a cat-napping and you don't want that person to fall on your property.