images re compressed wierdly


I am having an issue that my images look badly compressed (not blurred) in my posts.
see this post:
This supposed to be a sharp image.

Can you help me what causes the problem?

Attached is the original image

Hello there,

I hope you are doing well today.

The image does not look bad on my end but you can try using the following plugin to regenerate the images:

Best Regards,