Hi @Samreen Nisa Qureshi - There is nothing wrong. By default you have opted into the Udemy Deals program. This means they can sell your course for any amount they want. The price you set really doesn't mean very much. Udemy can set the price higher or lower based on some internal algorithms that attempts to maximize sales. Most new courses are automatically set at $19.99.
The only recourse you have is to drop out of the Deals program but then you are solely responsible for marketing your course. But you can set any price you want.