Tried a few different machines and some are definitely on the same subnet.
Sometimes run into issues with things that don't like the multiple APs and SSIDs on the network but haven't had that issue with a pi before.
Check the pi MAC address against other Pi MAC addresses on the network (even on different subnets).
They may not be unique, and router hate that.
@NotThamesWater started
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Tried a few different machines and some are definitely on the same subnet.
Sometimes run into issues with things that don't like the multiple APs and SSIDs on the network but haven't had that issue with a pi before.