code block error‼️

<img width="985" alt="image" src="https://user-images.githubusercontent.com/25260092/129464402-1dad4817-f5d7-4179-8fa6-0cf313abab9c.png">
When I am trying to write a code block, this kind of issue happened. Line number are wrong and there are huge blank in front of my code and in the end of my code.