The color balance looks off, looks like some processing error. I see a tear drop shape in some stars, which may be why DSS rejected a bunch. Can you post the Autosave.tif so we can check the first (easy) part?
If you stacked in DSS did you take the right Bayer mask? There's a list based on the camera model. That may cause color differences.
It would help greatly if you gave us all the details (raw or not, #biases, #flats, camera, important DSS settings, ...). Please fill out your signature with equipment listed.
... Henk. Telescopes:
GSO 12" Astrograph, "Comet Hunter" MN152, ES ED127CF, ES ED80, WO Redcat51, Z12, AT6RC, Celestron Skymaster 20x80, Mounts and tripod:
Losmandy G11S with OnStep, AVX, Tiltall, Cameras:
ASI2600MC, ASI2600MM, ASI120 mini, Fuji X-a1, Canon XSi, T6, ELPH 100HS, DIY:
OnStep controller, Barndoor trackers for 10" Dob and camera, Afocal adapter, Foldable Dob base, Az/Alt Dob setting circles, Accessories:
ZWO 36 mm filter wheel, TV Paracorr 2, Baader MPCC Mk III, ES FF, SSAG, QHY OAG-M, EAF electronic focuser, Plossls, Barlows, Telrad, Laser collimators (Seben LK1, Z12, Howie Glatter), Cheshire, 2 Orion RACIs 8x50, Software:
KStars-Ekos, DSS, PHD2, Nebulosity, Photo Gallery, Gimp, CHDK, Computers:
Pi4b, 2x Pi2b all running Astroberry, Toshiba Satellite 17"