Ya, listen to 61key, it sounds like when your copying and pasting in the main sequencing window, you're accidentally grabbing the last clap which is causing it to double up when you paste it. So you need to draw your drum pattern into a group first with the pencil tool. Then just click on the block that's created to highlight it, right click, then click copy. You can then paste that block (drum loop) anywhere you want as many times as you need.