Having A Problem With Changing Price

Recently I listed some large images so that I wanted to increase my sell¡¯s price. After I finished listing and back to sells page to check the price, all I can see the price shows the same as before, there is nothing change, even some of the prices a bit are cheaper than before. I have noticed the price wouldn¡¯t be changed when I have tried earlier, it wasn¡¯t work. But now, listed all new works, it still wasn¡¯t be changed, I don¡¯t know why that I can¡¯t raise price. Is there anyone knows the problem that I have? Please help me to understand what¡¯s wrong with me, thanks for everyone¡¯s advise and help!