Help me or my dad will kill me

so my car player used to close all the way in but suddenly it stopped for no reason.
but that happens only when car is on. so that means when i turn off my car player is closing all the way in normally . sorry for my bad english , you can easily understand what i am saying by watching the video i shot: https://youtu.be/IQRgsgopors

Often there is a tilt function on the player so you can tilt the screen for better visibility depending on your height, sunlight position (to reduce glare), etc. I'd suggest you check your owner's manual for a tilt setting.

-Rod

Yeah but i dont have owners manual and i cant speak japanesse( dvd player is on japanesse)

You probably won't have to search the Internet long to find an owner's manual for your car. Since the splash screen shows "Nissan" I'm guessing that your car is a Nissan and that it's the head unit that came with the car, but confirmation on those as well as any other details that might be relevant will help you get a good answer. Such as if the deck makes clicking noises when it fails to close, you connected the battery in reverse just before this happened, etc.

-Rod