Uploaded listing images being automatically resized

My previous post seems to have been deleted when I tried to reattach some screenshots so writing this again.

Encountered an issue where the uploaded images to a listing are being automatically resized to a max width of 800px. This happens when uploading images using the listing attachment box in the listing page (see attached screencap). Did some tests and GD seems to be doing the automatic resizing independent of wordpress’ media settings. Tweaking or even disabling WP’s resizing settings for thumbnail, medium, and large versions of uploaded images has no effect, and furthermore the resizing doesn’t seem to keep the original size version of the uploaded image (full size).

We are using a modified version of Supreme Directory theme and the first image in the attachments is being used as the full width background/parallax image in the listing page’s featured area (like in a vanilla Supreme Directory install). This becomes a problem since no matter what image size we upload we still get an image maxed at 800px width for the featured area, which becomes blurry or pixelated on large screens. Worse, since the upload doesn’t seem to keep the original size version, even when we force getting the ‘full’ sized image for the featured area (in geodirectory-compatibility.php) this is still just getting the resized version. Uploaded images in WP media library have no such problem but the listing attachment box doesn’t seem to work with the WP media center (listing attachments need to be done specifically using the attachments box).

Is there a way to disable automatic resizing in GD for this, or at least have this keep the original sized image so that we can get that for the featured area? Please refer to other attachment for installed GD plugins and versions.

Thanks in advance and best regards.