sounds like the ride bell. The ride cymbal is really cross-talky, as I get a lot of ride bell too. Personally, I never use the bell, so I go in and note chase>ride bell, and turn the volume down to zero. Either that, or I disable the 3 zone ride function all together.
If you want to keep it on, you should probably alter the xtalk on the trigger. I don't remember whether to raise or lower the xtalk value, but I'm kind of a Gordian Knot type of guy; simple, painful solutions.