Uploaded listing images being automatically resized

Hi encountered an issue where images uploaded to a listing are automatically being resized. This seems to happen only when uploading images using the attachments box in the listing page (see attached screencap). We are using a modified Supreme Directory theme and the first image in the attachments box is being used as the parallax background image in the full width featured area in the listing page (similar to a vanilla supreme directory install). The problem is that no matter what image size we upload the listing page would always display a scaled down version of the image that turns out blurry or pixelated on large screens.

Upon testing it seems that images are being automatically resized to a max width of 800px, and it seems that GD is doing the resizing independent from wordpress’ media upload settings (changing and even disabling WP’s resizing for thumbnail, medium, and large size images does not have any effect). What’s worse is that the resizing doesn’t seem to keep a full sized version of the uploaded image (or any of the normally resized versions of WP for thumbnail, medium, and large) so the code that’s supposed to get the ‘full’ size version of the image (in geodirectory-compatibility.php) for the featured area is just getting an image with a fixed width size of 800px.

Is there a way to disable this automatic resizing in GD or at least have a full sized version of the uploaded images so we can get that for the featured area? Please see other attachment for installed GD plugins and versions.

Thanks in advance and best regards.