Here's the quick fix.
After you create the 1st vlookup function, it will like this:
VLOOKUP(A11,’Product Database’!A2:D7,2,FALSE)
To lock the table range before you copy and paste the function, add the $ to fix the cell reference, as below:
VLOOKUP(A11,’Product Database’!A$2:D$7,2,FALSE)
This fix the row 2 to row 7. Of course, you can also fix the column A to column D at the same time:
VLOOKUP(A11,’Product Database’!$A$2:$D$7,2,FALSE)