Hi Jaire_McNichols,
I had a look at the OIV issuetable.jpg that you have put up here. So it looks like there is no heading defined. If you have a look at the properties of the Oriented Imagery dataset layer in ArcGIS Pro, under the oriented imagery tab there will be a Camera Heading default value. It might just be undefined.
If you added these images using a text file, then its basically read the EXIF data within the image and used the GPS information from there to get the position. However it seems it does not have a heading info. Do you know the source of these images? What camera was used. Can you send me a couple of image so I can try it out.
Thanks
Randall