Hello @essaund,
Everything works fine. The plugin consciously uses the original image in this case, it is a planned action. This situation means that you have compressed the images before. You’ve probably used some image compression tool, right?
You need to know that reducing the weight of .jpg files means a loss of quality. If you convert .jpg. to .webp, you reduce weight without sacrificing quality. For this reason, it is better not to compress the .jpg or .png files themselves, but to convert them to the WebP format.
I believe that this assessment is not deserved. It is not the plugin’s fault that you previously compressed your images. Am I wrong?
Best,
Mateusz