The Upviral customer success team has reviewed the pre-launch contest and said that emails invited by the first place are legit (screenshot with the conversation posted on our Discord community). Leads have different IPs and they also confirmed their email addresses, because I have double opt-in active.
The multiple names that appear on different pages on the leaderboard are not exported in the Leads CSV so they escalated this bug to their developers. Probability it's just a UI issue when switching pages fast in the Leaderboard component
Now that I have their confirmation that everything is fine, I have resumed the pre-launch contest on Upviral platform.
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