tools automatically move (tool errors)

When i using a brush or an eraser, I want to choose something hard or soft.

when i press it,  it go away to burn tool or sharpen tool.

So I turned the computer off and on.

also i had remove the photoshop and put it on again. How can I prevent errors?

It's not a problem with caps lock. i had  turn it off and on..

i also try to solve this problem

Reset the preferences settings:

edit -> Preferences-> general

click “ reset preferences on quit” then restart photoshop

but still erros happen.

also pls anyone tell me the way of modify to this question.