HLOOKUP FUNCTION WITH STRUCTURED CELLS

First time asking for help. I have been on this problem for 6 days and desperately need help. Here is my problem: 
Enter a formula using the HLOOKUP function to determine a staff members base salary (which is based on the number of years of service).
Use a structured reference to look up the value in the SERVICE YEARS column. Retrieve the value in the 2nd row of the table in the range (Q15:U16). Since base salary is tiered based on the number of years of service, find an approximate match.
Here is my formula =HLOOKUP([@[Service Years]],Q15:U16,2,TRUE). (True equals an approx. match)
What I get back is the correct amount in the active cell but #N/A in all cells in the Service Years column.  Why does my formula not work in all the cells in the column?

Thanks to all for the help.