If jam drops are not prepared correctly, they can be prone to spreading due to their high butter content. While some spreading is normal, sometimes they can spread too far, resulting in flat biscuits. Your biscuits may spread too far if you skip chilling the dough, add too little flour to the mixture or if you grease the baking paper. Measure the ingredients accurately and chill the dough to prevent excess spreading. If your dough has warmed too much when shaping (or you are cooking on a hot day), you can place the tray of prepared biscuits in the fridge for an additional 5 minutes, to firm up before baking.