Facebook doesn't show pictures clearly with iPad 2

Hello ,

This thing is driving me crazy now , and I have had this problem since I got my iPad last summer

It is just whenever I open Facebook , I can't see the pictures clearly , it become blurred

But some pictures are clear ( randomly)

I have no idea what's wrong

It's ok for other sites and apps like twitter

I updated Facebook , delete it and re download it nothing changed , also my ipad is updated

I have an example but I didn't know how to post it here

I need help!

Thank you