I’ve had something very strange happen on a seat map about 80 hours prior to a short flight to the near continent on an A319.

Me and my partner (both gold) were happily in 10F and 10D when she was booted out all the way back to 16D. When I looked at Expertflyer, 10D shows as blocked and we cannot select it anymore (we’re now in E+F which is fine).

My question is - could this be a case of a broken seat having been reported and it therefore being blocked? Is that even possible that far out (80 hours), where the precise aircraft operating our flight is unlikely to be known. Also, would they fly an A319 with a broken exit row seat for potentially 15-20 sectors? Why did the computer move her all the way back rather than the empty middle seat (which did not show as blocked on EF)? I’m very curious.