She hit the nail on the head. She asked "is the fabric the right way up?". Being upside down and sideways myself, I had no idea. So I got out my trusty sewing gauge, and looky here.
Going horizontal, I have 29/30 count.
233 stitches ÷ 13 would be 18" length. That's still smaller than I would end up with, but explains the mystery. But doesn't explain why the weave looks even while being 3 or 4 threads off per inch.
I started on another piece of linen that I dyed in that group of browns, and checked the count both ways before starting. I should have enough and the colors I chose should be fine. The linen is warmer and happier than the crabass I wanted but that's OK. What will I do with this piece? Wet it and throw it in the dryer. Usually, it comes out smaller with a tighter weave, maybe it will correct this. Maybe I caused it when dyeing. Whatever, I would never have thought to check this had Lynda not mentioned it. So thank you again!
Have a great day everyone.