I put this up on the wall and used mock sashing to see if it would line up and it doesn't! I am not an experienced quilter so I have no idea what I need to do to fix it. I cut my sashing 1 1/2 inches. I didnt bother with other side. Its the middle panel that is the issue and if I made the sashing above and below it wider, it won't be even with the others. Help please!!