Images completely out of focus only on front page

#1
Hey there,
I have a very strange problem with my images and I do not know how to fix it. On my front page the pictures most of the times are completely out of focus. The first picture is sharp most of the time but when you keep scrolling, all the other pictures are low res. On every other page the pictures are crystal clear. And the strange part is that sometimes the pictures on the front page do appear sharp. But that's very rare. Does anyone have a solution or clue what that could be?
Thanks in advance
Best
Leon
 
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