Hello, @Jubaer,
I have checked your site and found no issue, it is working fine. I changed the footer image and it appears just fine please check back to your site after clearing the browser cache. I hope you will never face any issues.
I made a video while I was testing for you, here is the video URL please watch it complete here: https://streamable.com/xp7i7f
Regards 8Themes Team.