I hope you are well today and thank you for your question.
I am not sure what you meant by it so could you please describe it a bit more in detail by sharing screenshot and page URL from your site where it is displaying so that i can help you?
Solution for this topic
I visited your shared site and it seems you are using Jetpack plugin on your site so could you please try temporary deactivating its Photon module on your site as shown in the attached screenshot?
This jetpack photon module is not updating the images stored on wp.com so to resolve the issue either disable this module or update the images on wp.com by contacting jetpack support team.
Then try regenerating thumbnails using the below plugin.
Then please use below plugin to display image properly.