File (size) Upload Query

I've used DB to create a file upload page.

I've set the image to 'Keep existing format'

Heres the snippet:

<
WA_DFP_SetupUploadStatusStruct("WA_UploadResult1");
if(isset($_POST["nhSendUpload"]) || isset($_POST["nhSendUpload_x"])){
WA_DFP_UploadFiles("WA_UploadResult1", "nhImageUpload", "2", "[NewFileName]_[Increment]", "true", $WA_UploadResult1_Params);
}
>

However all the images ive uploaded, have been reduced in file size using this setting.

For example a 400Kb file has been reduced to less than 40Kb after uploading

Surely this would only happen if i had selected the convert option to jpg, quality 80?

Any ideas why this is happening - is this expected behaviour?

The upload settings should be above that code. Can I see those? By default the image shouldn't be resized, so I'm not sure why it appears to be in your case.

Does the image still display when viewed as the smaller size?

Yes, Im getting two images as per the upload config, both are displaying at their prescribed dimensions.
However, for some reason the file sizes are being compressed to about 20% of their original upload size!

Please upload a copy of the .php page so I can take a look. Don't save it in another format, you can upload the .php page directly.