MIDI in Logic is a bit… tricky.
I’m not sure if Logic X is still the same way as Logic 9 (I can check later) but I suspect it will be. First thing to do is to check in the recording options if there’s an option to “auto-demix” the MIDI channels. This is because by default Logic actually sends all incoming MIDI data to all armed midi tracks.
So turn the auto demix on, but do also try it with more than one track armed in your project. Because IIRC it doesn’t work if you only have one track record-enabled, it still just directs all the incoming data to that one track.
Try that and see if it works. If not, you’re probably looking at having to use Logic Environment to force the MIDI to where you want it, which is horrible but can be done.