Countifs is not connecting to reference cell

In the above formula, the "Z Number@row" reference is not linking to the cell in the "Z Number" column. I have used this formula many times (in the same grid) for other data, but this one originally shows Linked (Blue underline) when I write the formula (linked), but then shows an "Unaparseable" error. When I open it, the blue underline (Link) is no longer showing and it just looks like regular text. Any ideas?

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