What type of stabilizer is in the blocks?
Trim the stabilizer out along the seam line. Did you also trim out the batting from the seam line before you put the background fabric down? Some EMB designs stitch the batting just a bit smaller to avoid the bulk in the seams.
If you didn't trim out the batting, there is a trimmer tool with an edge on it. You can also lay a long ruler right over the edge and trim. Go to the 42 minute mark to see the technique.
https://www.youtube.com/watch?v=fkx4...js1nEVpKvb0_rx