Hello @MHM Cisco World
What you have posted would produce that result, I am on about a more complex network or in the diagram the OP has posted in that the rtr has dual paths into the internet.
Where ever that destination is within the internet, it possible the receiving rtr prefers to route via a different path back to the OPs rtr, So when the OPs rtr is PBR'd via its alternate path or in your case PBR'd via rtr2 , the request is forwarded to the "another" rtr on the internet as such when that rtr responds it may have a more preferred path to reach back to the source network.
In your case it will be to rtr1 other than r2 or in the OPs case via its primary interface where I believe uRPF is enabled in either scenario this is where asymmetric routing could possibly be produced, plus the OPs rtr will drop traffic because of strict uRPF being enabled.
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Kind Regards
Paul
