Not really a question, but just wondering if this is a one-off glitch (and if so, how does this happen?)

I was shopping for WAS - CDG and found a good-looking UA fare on Kayak. The "View Deal" button took me to book it on Delta.com, which is really strange. The fare was wrong so I didn't go through with it, but it seemed pretty full-featured; I could even view the seatmaps and proceed through to payment.