Conditional Format formula does not correctly FILL adjacent cells when values not equal

Hellos Excel friends,

I have searched and not found this particular type of question in the archives. Hopefully it's simple and I just cannot see it.
I merely want to highlight two adjacent cells when the values in the adjacent cells are not equal.
I used the following formula:

Please Login or Register  to view this content.

I reduce each one (see: -1, -2) to exclude the space in column A, and to exclude the trailing comma and the space in column B.

Thanks for any assistance provided!
*I have attached a sample spreadsheet.

Thank you very much Pepe Le Mokko, works like a charm.