Table Builder seems to use Insert Columns when the Run button is pressed which leads to the original Header and Field descriptions being moved way out to the right into columns that are not expected to be in the active range of the sheet.

How about changing Insert Columns to Insert Rows such that the Header and Field descriptions are in the same columns as the actual data is.

This is not a big deal but it appears like a simple fix and is more intuitive to what people would expect to see.  i also have a feeling that it would make calculated columns easier but can't say that for sure without testing.