FAQ: I have updated my images but I'm still seeing the old ones
When an Experiment Builder project builds, it will create cached image files based on the screen resources in your project. It does a quick check to see if anything has changed since the previous build and if the same image names are used but the actual image file contents have changed then it will skip this image building process (the cached images are still used to save time in rebuilding the entire project).
The solution is to just run Clean (click the broom icon) on your project – this makes the project delete the old cached images and forces it to recreate the cached images on the next build.