Image sizes being changed when displayed in Illdy theme

I am having a lot of trouble with the Illdy theme changing my image sizes. I have two images which I am displaying in the services section, each 800px x 516px. After uploading them, wordpress shows them in the media library as being this size. But when I display them on the site, they are enormous, and no matter what I do the image size will not change to the size they are supposed to be.

I attached an image of the exact code I am using. As you can see I explicitly put the image size I want in the code, but this still changes nothing. I removed the class “alignnone” that seems to be automatically attached to the images, this also seems to do nothing.

Can someone please tell me what is going wrong? I am at a loss at this point.