Hi Fuzzy penguin! Are you trying to drag from the "history bar" above the combining area? If so, make sure you hold on an element long enough for it to pop out of the bar :)
We'll be working on making controls and gameplay mechanics a lot more crisp and clean as we further develop the game, so be sure to drop a follow or add this to your collection if you like the concept and want to play it when it's more fully developed