different widths, are a defect.
Personal issues aside, check the MC of individual boards and their widths,
that will tell you what has happen...had one this summer, LL, 6 inch planks, tight when installed, now, there are gaps, and the widths are all different, ranging from 6" to 5 63/64" down to 5 60/64", and now, five months after installation, all are in the 8 to 10% range, which is normal for midlands SC. and last visit, are starting to cup but still gaps, same sizes,
Subfloor Osb ranges from 13 to 15%.
LL says, there are no drying irregularities. So, after fully acclimated, I have gaps and a whole range of different sized planks, and starting to cup.
they are blaming the installer saying he did not acclimate the wood but if he had, fully acclimated it, well, and this is the second order for this consumer, the first one had gaps as they were installing it.
took it back, got this batch, and now gaps and cupping,,,cupping happen much much later, after it gapped.
but, gaps, in SC, in the middle of a southern state, in the summer, AC on, but still, gapped in SC in the summer??? Rh was in the 40 to 45% range during inspection.
life is good, lets have fun