Hey there everyone I'm new to this site and not sure if this is the appropriate place for this post so I apologize if its not. Anyway my question is I made a coffee table about a year ago, here are some pics of it. I have recently had some trouble with cupping its about an 1/8" on one side and 1/16" on the other the top is two 5/4 book matched maple boards 50" in length and 18" wide. When I attached the top I didn't have a good understanding of wood movement and I attached the top with with figure eight fasteners instead of buttons. I was told that this would not allow for movement if they were used length wise along the grain. I also only put poly on the top and sides of the top. Are either of these things responsible for my cupping issue and if so is there anything I can do to fix it? Also if you notice because of the design I can only attach the top length wise so screwing it to the base doesn't really pull it flat.