Help needed to correct a formula showing a 'false' result

Good Afternoon
I have attached the sample workbook, it consists of a few sheets which I eventually only want to have to enter one set of details into 'sheet 1' and then it populates everything else, but that a big project, for which I will be seking more advice later. For now though. I have put a formula on Sheet 1 columns L and M. and I cannot workout what is wrong and why it puts 'FALSE' in one column (instead of being blank)
and the correct answer in the other column. I would appreciate it if someone could take a look and advise what I'm missing, Thanks

Thank you, to both of you, such an obvious answer, when you are shown it, but no so easy if you can't see it. A great help