Short flanges on the Hub- try crossx2--Start again on the calculations
Just guessing as I put my wheel builds out to someone who knows what they are doing
My wheel builder had a similar problem with my Tandem wheels. First set of Hope Bigun hubs to downhill rims laced by 3 were fine. Second set felt different and were only X2 lacing. The builder had made a mistake but did not spot it till the wheel was half built. It did make a difference on the ride but shortly after I changed the Forks and got a Thudbuster so did not feel the difference.