It appears to me that the 2 bottom widths (rows 5 & 6) are about 3 strips wider than a couple rows above.
The row with houses - row 4 - looks to be lacking 3 strips on the right and 1 on the left.
Then rows 3 and 2 look to be lacking 2 strips on the right side and
Row 1 looks like it's missing 3 strips on the right.
Is that what's going on here? Are your strips all the same width? Is it 2 inches?
DIane