This is expected behavior. Redirection rules are meant to send visitors to different landing pages and offers should they meet the criteria of a rule.
If you have the same offer using multiple rules, for data efficiency, Thrive will display the overall stats for that offer for the entire campaign, regardless of which rule tab you're using to view the stats of the offer.
To view stats for all landing pages and offers in your campaign, use the "Performance Overall" tab:
If you wanted to see how an offer or landing page performs when associated with certain variables, then please use the Drill Down Report tab instead and drill down by the variable you want to analyze the stats for.
For example, drill down by Device Type, then by Offer.