Dear Angela,
Thank you for reaching out to us.
I just reviewed your venue profile and noticed that the new image is displayed (colourful wall image) perfectly, irrespective of the width of the screen. I think your browser is showing the old image because of the cookies or cache files. Please delete them from your internet browser or try using a different browser and then test it again.
If the problem is still not resolved, please reach out to us and we will be happy to assist you further.
Have a great day!
Regards,
Sid Sarin