[BeardFace (Nial)]

Hey all, I've run into a bit of a weird issue here. I've taken a bunch of photos of the Helix nebula over 3 nights, done my flats/dark flats at the end (I know I should be doing it each night but the observatory flat panel is on the fritz), used some darks from my dark library, and processed with wbpp.

However it looks like the flat is getting applied twice, as well as being flipped? I've attached an image of the master light vs the master flat. It looks like the one big dust mote is getting applied twice and flipped, creating a weird artefact with the dust mote. In addition the general noise of the image is WAY off what I had with the Cats Paw (also image attached). I haven't changed any settings in the WBPP since capturing them both.

Any help would be greatly appreciated