Midi playback weirdness

I’m new to Cubase and from what little I’ve learned so far I think I’m really gonna dig it. I ran into a weird issue today and was wondering if someone can help me out. I’m pretty sure it’s pilot error… I have EZDrummer loaded up and working fine as long as I playback from the beginning of the midi region. If I start anywhere else I get a loud Kick/Snare/Cymbal hit…even when there is no midi data at that point. The following video shows what I’m talking about. Sorry about the poor quality. Thanks for any help.