[Mobile] article header disappears

On my Homepage, click on any news article, you will see the article header on mobile will disappear, it looks a parallax effect,

https://cdn.livechat-static.com/api/file/v2/lc/att-old/8801096/beb55940846b13135fe971b0dd78dcd0/IMG_1421.PNG
https://cdn.livechat-static.com/api/file/v2/lc/att-old/8801096/f1dd6a1a9898cdc4094390fa9208d8df/IMG_1422.PNG

It is not happening on the desktop. Can you help me stop it on mobile as well?