Strange bug: Upgraded twice into the same cabin
I booked an international trip 4 weeks ago and SWU upgrades were available for both my outbound segments, which are this coming Monday, and so I was upgraded then and claimed seats in the front cabin.
This morning I got a 'your upgrade has been confirmed' email and a new seat assignment (3F instead of 3A). 3A is now not available, but 2A is, which is just as good (E175).
It seems very odd - and certainly new to me - that the system could confirm an upgrade for a passenger already in C. Anyone else known this happen? Is there something wrong with my ticket potentially?