Hey @Kiss the Moon 

Welcome to the Klaviyo Community! Happy to help with your images in the template builder!

I would recommend clearing the cache on the browser and restarting your browser as this may happen from time to time. If the issue persists, I would further recommend using a third-party image editor, editing the picture, and then uploading it back into Klaviyo. The article I included covers some of the best practices for images in your emails including optimum image sizes and formats to help reduce the challenges you are facing with the images not saving correctly when edited within the template builder. 

Also check out these other community post about using images in your marketing!

I hope this helps get you back on track! Thank you again for being part of the Klaviyo Community!