Okay so it looks like the block is the sum of the two blocks beneath it? Are we reading the ibstructions correctly? I guess -50 works for the bottom right but yeah the 840 one is nonsense.
EDIT: Dr. Bob figured it out, and you're going to hate it, the figures make sense if only the ENTIRE ROW is EQUAL TO the OTHER ROWS, the bricks touching means nothing and a brick's value is independent of the two immediately beneath it.