The GetColumn function returns a list (the green column block). When you add the gear/list block in front of it, you make a list containing a list which is not what you should be doing. If you only want to compare the last cell in the column to the user’s input, then remove the gear/list block.
If instead you want to check if the user’s input matches any cell in the column, use the does list contain block instead of the = block.