Despite having standardized the look-up field, my table is giving very distinctly different answers in the formula field. An image of the formula field + look-up field are below. What could possibly be going wrong? What can I test to fix?
More often than not, a lookup field returns an array, not a string, and FIND() only works on strings. You can force-convert the output of any field into a string by concatenating it with another string, including an empty string: