When you create a sale event for your Etsy shop and include a call-to-action banner, this banner is added to your main image.
When the sale ends, we remove the banner from the image. However, mobile devices tend to show images from their local cache (memory) instead of bringing a fresh copy from Etsy. In such cases, you may see the banner still showing, although on Etsy it does not.
If you know how to clear your browser cache on your mobile device, you can do so, and a new banner-free image will appear when you browse your shop.