I just found out that the flight times for my upcoming United flight are slightly changed, and when i went to the United.com website to check it, i found out they preserved my original seat assignments but my seats are now in Economy Plus (i guess they changed planes). When I go to the seat selector, it says the cost is $44, so I cancel out of that, and it keeps my original seats in E+.

When I originally booked the flights, the seats were not Economy Plus so I never paid any fee. Will the airline try to charge me the $44 when I check in? There are no other non-middle seats available since the flight is a month away, so I don't want to change seats now.

If anyone else has had this experience, I'd appreciate any insight. Thanks!