Vlookup persistent #N/A error?!?!

Hi all,

Been scratching my head over this one. Basically I'm trying to create a spreadsheet for my everyday use.

The spreadsheet consists of doing a series of simple additions. Then what I want it to do is then use vlookup to look up the maximum value from my 8 equations then output the governing equation.

I've tried formatting my cells to make sure they're all numbers/letters format. Then tried making sure there are no odd spaces etc. Then tried checking character length etc, but can't make it work!

The bit I'm trying to output is in the 'Governing' cell which I've highlighted in a red box already. (To be more concise, I've determined that my max is 7.44kPa then I want it to output G + Ql + Ws,up? But keeps giving me the #N/A error)

Any help is appreciated.

Excel file attached.