Something strange is happening on the last measure of my song. I added a realtrack guitar (~510:Guitar, Electric, Rhythm Dire) to the song. I want to hear just the guitar and let it sustain from beat one to the end of the bar on the last measure. So I clicked F5, muted the other instruments and then wrote my bar chord as Db... Well the chord sustains across the measure but it is an entirely different guitar, a loud distorted electric power chord.
Why is this happening and how can I fix it?