Be careful when using the "key <> pressed" reporter if you are using it with a string input (rather then the drop-down). Press "left arrow", "right arrow", "L", "R" and see the results. See inside.
If using a multi-character input, and Scratch does not recognize it as one of it's multi-character keys (eg. "space"), it seems to recognize the 1st character of the input as a match; returning the match as true.