Incompatible dimensions when multiplying by a dimensionless number

I can't figure out why the first equation in the picture does not work, Mathcad says "These units are not compatible." The units of M.w.mid are kip*ft, and 8 is dimensionless. There are no matrices in this spreadsheet, but for some reason the dot/multiplication symbol is acting weird, or like a dot product. I don't really want to use either of the middle equations, because they don't match AASHTO, but if I have to I will. For reference, the correct answer is 103.0kip. Mathcad 15 also returns 103.0kip without a dimension error.