Not sure what just happened: I booked an award ticket from EWR-TLV in August and flew business saver (60k) on the way there and economy standard (75k) on the return home. I tacked on a one way flight to LAX scheduled for tonight but got round trip $25 from Delta for next month so I decided to change my reservation. When I changed the flight to EWR-MIA on 4/3 I saw that it would cost $50 to make the change and I would be refunded 40k miles. Then, I did the same thing for my wife's reservation and it only showed a refund of 20k miles. I kept on clicking back and reselecting my flight and then it showed a refund of 60k miles! I quickly finalized the changes and took multiple screenshots/saved the receipts. I just checked my United account and 70k miles were redeposited. I'm still not sure if this was a mistake so should I call and ask for my other 30k or lay low and be happy with what I got?