"match" (in CALC Version: 6.2.2.2 (x64)) is not working right...

I am building a rather large and complex "design project management: (Calc) spreadsheet. The user selects a “Design Type” using a “validity” command. Elsewhere I use the “Match” command to get the “offset” from the validity’s “source text.” It does not always work.
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This is the "source for the “validity” and associated data.
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This is the “result” of my “match” and “offset” efforts.

The “Match” command is written as: “=MATCH(AMG6,$‘Operational Data’.$AMC$3:$AMC$13)” in my code. ???

Yes – I aman idiot! I left off the Exact Match 0 from my Match call. What mind???