Please stop creating further topics here if you're not willing to co-operate, Mateo.
There may be a chance that some special images might cause issues - yes - but you can't expect us checking zillions of pictures until we incidently find exactly the one you are using.
Since there's no easy way to access your site,
please provide a download link to a sample image you are using
and a screenshot that is showing the blurred appearance of that image
And just in advance:
You're NOT using that Reduce Image Size component?