The problem is that it's selective. The Targas I've edited have the opposite "flippage" to the ones that are unedited.
It suggests to me that there is some kind of flag in the Targa that Photoshop is honouring (and removing by "applying" the flip during editing), but ImageSource isn't. If you open the linked images above in Photoshop, both look normal. With ImageSource, one is flipped and one isn't.
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