I have this problem with Vlookup which is already getting on my nerve, I cannot find any generic problems that are the same as mine. Anyways, Vlookup seems not to give out any value or even errors, it just sits there like a text; like this - VLOOKUP(F2,'Reference Table'!$E$1:$H$37,2,0)
Even if I drag this formula down it just copies the formula as a text.

