mobile app on line check in

Just checked in for flight tomorrow to SFO
Used the mobile app and it told me they had moved my seats in upper even though i selected them months ago and the seat map actually had me in the same seats anyway
Then it wouldn't give me a mobile boarding pass said i had to collect at the airport
Cause for concern???
Used the mobile app and it told me they had moved my seats in upper even though i selected them months ago and the seat map actually had me in the same seats anyway
Then it wouldn't give me a mobile boarding pass said i had to collect at the airport
Cause for concern???