How to render

Hello everyone. I’m using the HardKnox kit. I click and drag Groove 1 pattern to arranger window. I then chop up the parts as desired. But now I have two problems. 1) Even though I have “follow transport” on, stopping and starting playback makes Groove Agent hiccup and beat goes out of sync; 2) freezing and attempting to render the beat to a contiguous audio file does not work because Cubase doesn’t recognize all the slices I made. How can I render an audio file that has all my edits? Hope this make sense