Long story short, in the BGP-land, routes are not decided based on geographical distance, but based on a set of complicated criteria, mainly the AS-Path (AS = Autonomous Systems, think ISPs), i.e. “how many ISPs do I need to pass through to deliver this packet?”. ISPs can also prefer or avoid upstreams based on business relations (are they a direct customer of us? do they pay us more?)
In this case, Orange probably has much better “peering” in Paris – they can effectively reach us in a single hop there. This is probably why it was selected by Orange. I am not sure if they peer as much in FRA or WAW. This could also be a business decision (preferring to route traffic back to Paris inside their own backbone network might be cheaper for them than to FRA).