Has anyone experienced Product Hunt upvotes disappearing or not showing up?

I launched a product just the other day and several people have told me they've upvoted it, but those upvotes either never appear on the page or disappear shortly afterward. I'm aware Product Hunt has anti-fraud systems, but these are genuine supporters. I'm trying to understand whether this is expected behavior, a delay in vote processing, or something else. Has anyone else experienced this during a launch? If so, did the votes eventually return, or did you need to contact the Product Hunt team? I'd appreciate hearing about your experience or any advice. Thanks!