Question

after pressing every key should return to ​

Answer 1

Answer:

I came across a user who suggested this issue was due the Windows Mobility Center running in the background.To fix this problem he has suggested to Press the Windows key (the one with the flag/window picture on it) + X, it should open up the Windows Mobility Center (otherwise just search for it in the Start menu,search box), then simply close it.

Explanation:

Other problems related -

If the issue persists even after reseating the keyboard and if the external USB keyboard works normally,than you need to replace your system keyboard.

or

Is the return key stuck? Try using a can of compressed air to make sure nothing is stuck between the keys.

Are all the other keys working normally?