Conditional formatting not working with formulas?

I have two columns, one being first name, the other last name. I have 5 sets of these columns. I've taken it upon myself to combine the rows for any easier comparison. What I'm trying to do is find the duplicates between set 1 & 2, 1 & 3, etc. In the end I was expecting to find every name highlighted as each name from the following sets after 1 should already be included within the list of set 1, I'm just double checking here. Anyways When I use conditional formatting on the full list of names starting with set 1 & 2, 1, & 3, etc. some names do not show up highlighted. For example, when I check for duplicates of last names between 2 sets I get highlighted answers. When doing this same thing for formulas of full names though I get none. Why is this?

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