I'm flying out on Saturday morning and I finally seem to be able to make seat changes in my booking. A few complete rows are still free and I noticed the seat next to me was full so I move myself to another seat in a row still empty. Now the new seat next to me (window, K) is taken

and when I chose the one next to window (J), then the aisle seat is 'blocked'. What's going on there? Could it be Qatar Airways messed something up here? I'm flying to that destination alone with my husband following a few days later. We fly back together and I requested by telephone to sit together on the return flight. Almost looks like my husband is shadowing me