Where exactly is it stuck?
Scripters don't handle refunds nor sales
A message is displayed on the canvas about that, there's nothing wrong with it
Make sure the client has plenty of CPU available, it doesn't work properly inside virtual machines or any restricted environments, avoid using lowcpu mode. If using mirror mode, restart it after several script runs as it is known to have some memory leaks which reduce performance over time.
Go to the default tab and remove any existing placeholders, look for Games necklace ones, mirror mode has some banking bugs. Collapsing the tabs should help it find items.