I logged into MMB and my pre-assigned seats have shifted. Was in 19A outbound and 19K inbound (selected as there is no row 19 on the 787). Now in 22K outbound and 23K inbound. MMB shows aircraft type is 788 on both flights but the seatmap is not showing. Called the Gold line and they say row 10 is blocked off for now and the first row in ET is row 21 which has been allocated already for my flights.