strange input error

ok i seem to have coded somthing wrong?
i am making a basic pong style game and have the keys(a +z) (up arrow + down arrow) for the input to move the pong paddles.
it works at first but after i have pressed the (a or z) key any key after that moves that paddle evan esc.
here is an example if i press up the left paddle goes up now i press esc it moves up more. then i press z it moves down. press up arrow moves down again.

here is the part of code that handles the key presses sorry if its messy.

Code:

//While there's events to handle
        while( SDL_PollEvent( &event ) )
        {
            //If a key was pressed
            if( event.type == SDL_KEYDOWN )
			{// left paddle keypress
				if(event.key.keysym.sym == SDLK_a)
				{
					leftPaddle.yVel = -10;
				}
				else if(event.key.keysym.sym == SDLK_z)
				{
					leftPaddle.yVel = 10;
				}
			
				
			
			
//rightpaddle keypresses
			else if(event.key.keysym.sym == SDLK_UP)
				{
					rightPaddle.yVel = -10;
				}
			
			else if(event.key.keysym.sym == SDLK_DOWN)
				{
					rightPaddle.yVel = 10;
				}
				leftPaddle.p_PaddleMove();
				 rightPaddle.p_PaddleMove();
			}
     }

edit:
ok sorry i finnaly relized what i did wrong

Code:

  if( SDL_PollEvent( &event ) )
		{
           //If a key was pressed
            if( event.type == SDL_KEYDOWN )
			{       // left paddle keypress
				if(event.key.keysym.sym == SDLK_a)
				{
					leftPaddle.yVel = -10;
					leftPaddle.p_PaddleMove();
			
				}
				else if(event.key.keysym.sym == SDLK_z)
				{
					leftPaddle.yVel = 10;
					leftPaddle.p_PaddleMove();
			
				}
and so on