why backselect key is auto run?

[luminnaing]

why backselect key is auto run? like that>>> \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
plz help me sir

 

[hang-the-9]

No clue what you mean here, if you are talking about a stuck key, you can try to pop it off the keyboard, make sure it's clean and put it back. If it does not help, replace the keyboard.