Jacob,I am sorry to hear you had some difficulties with setting up our table. You will be glad to hear that we have changed the way we pre-drill for the legs to prevent issues like you had. When we glue boards there can be a variance in the widths due to the machining of the wood. To fix the concave in the board you need to loosen the inner nuts and snug up the outer to pull the edges together. Check out this video https://youtu.be/RF1Cb7iNXxM
And as always feel free to contact us anytime
Brian Poll
800-565-0977