I haven't experienced anything that extreme. I've had subtle variations based on fabric, oxford vs linen for example. This seems like an error which, as you said, I'm sure they will correct very quickly for you.
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I e-mailed Theresa about this, so I'm sure it will be resolved ASAP as Luxire always has done, however, curious if anyone has had the same issue.
Just ordered an Oxford ( the fabric is one of the nicer oxfords Ive held, http://custom.luxire.com/collections/oxford/products/red-university-stripes-oxford) and the measurements came out nearly 1.5x what they were on my previous order.