Check your send. It sounds like you are sending only one channel to the reverb. You probably want to change 1 -> 1/2 to 1/2 -> 1/2. Then, put the send post pan/post volume. EDIT: Hang on, are you putting the reverb in the same track as the source? Don't do that. Create a new track and put the reverb 100% wet in there. Then send your guitar track like I talk about above.