Problem
An incorrect image appears for equipment in the mobile view in Pricebook but you can't find it on the office side when you edit the equipment.
Solution
The image is assigned to the category in your Pricebook. When a category has an image, it displays for all equipment under that category in the mobile preview, even if the individual equipment item does not have an image in the edit screen. To remove it, edit the category's additional details and delete the image.
Edit Pricebook category details
Go to the navigation bar and click Pricebook.
In the side menu, click Categories.
Locate the category where the equipment is assigned and showing the incorrect image.
Click More actions
and select Edit Additional Details. 
Hover over the image and click Delete.

When finished, click Save.
To learn more about Pricebook categories, see Create and manage categories and subcategories in Pricebook.