Yep as it says now on the web site, it's an orphan.
The timing was very close so it simply depended on if anyone saw our block first, but that was unlikely due to the timing.
So basically we sent our block out on the relay (000026e9) but then got the other one (00001735) before ours came back
The relay is clearly running slow

We sent, then got the other one 652ms later, then finally got ours back 1537ms later.
i.e. they had sent it out on the relay just before we did, but we didn't get it from the relay until after we processed our block (which only took 240ms) and sent out our own