Yes, I understand your frustration - there are a few areas of the plane where you're at greater risk with seating. Row 1, the row just behind the CE curtain and also the exit rows.

For Row 1 there does seem to be more chance of being bumped. I can't explain why but it's happened to me on and off over the years.

For the row behind the curtain, the curtain can move and then move back again.

For exit rows, even if there is a TS seat block, the exit rows seem to be most likely to end up with the middle seat occupied.

They're all frustrating but BA always uses their catch-all which says seats can be changed. You're still in CE, and there are only 5 rows so you won't be waiting too long to be served. I assume Row 2 has gone now?