title: Android: RecyclerView content messed up after scrolling
body: <p>I'm using RecyclerView to display a list of marks, and each mark of the value is shown as a CardView. But some contents of the cards are lost after the scrolling the RecyclerView down and scrolling back, as shown in the two screenshots below. The contents in the red rectangle is lost after scrolling.</p>
  
  <p><strong>BEFORE THE SCROLLING;</strong>
  <img src="https://i.stack.imgur.com/bYs8H.png" alt="enter image description here"></p>
  
  <p><strong>AFTER THE SCROLLING;</strong>
  <img src="https://i.stack.imgur.com/Zv9nO.png" alt="enter image description here"></p>
  
  <p>I'm wondering whether or not it's a bug of RecyclerView and find no solution after Googling for it.</p>
  
  <p>All views are invisible except the title, their visibilities are depends on the mark's value.</p>
  
  <p>Does anyone know why this would happen? </p>