How to fix VLOOKUP when it returns the incorrect value from the bottom of the list?

In Google Sheets, I am having trouble with a VLOOKUP function.

• range argument A2:B contains text strings.
• search_key is in column C, example, C2
• index argument is (column) 2, which is equivalent to B2:B

Current Formula

• I thought my syntax was correct, but my VLOOKUP formula returns the wrong value.
• In column A are the textual search keys and in column B are the values that I wish to return. Values are sorted.
• Note that #value! in IFNA is intentional. I want to use the results in a TOCOL function and it was not treating "" as a blank ("ignore blanks") so I replaced "" with #value! and used "ignore error" instead.

=ifna(vlookup($C2,$A$2:$B,2),#value!)

Sample Data

• B2:B strings are actually 50 characters in length (not 10); they've been shortened below to save space

Link to Test Spreadsheet illustrating problem