As I already PM'ed, you have some small problems in your data that cause Wipe to lose track of the 'real' background (so called 'dark anomalies' - read the help in Wipe for more info).
These problems (some dead pixels and faulty columns) cause pixels in your image that dip below the real interstellar background. This confuses Wipe and it will assume that there is a sharp gradient that needs to be removed.
They are easily dealt with by either masking them out (so that Wipe doesn't see them to begin with), or, if they're small, by upping the Dark Anomaly Filter. It turns out the latter was enough for this image.
I processed it in 1.3.5.279;
--- Auto Develop
To see what we got.
We got a green/yellow cast, some stacking artifacts and fairly bloated stars.
Oversampling isn't too bad and data quality seems reasonable.
--- Crop
To better frame the galaxy (and get rid of stacking artifacts).
Parameter [X1] set to [838 pixels]
Parameter [Y1] set to [478 pixels]
Parameter [X2] set to [2148 pixels (-890)]
Parameter [Y2] set to [1477 pixels (-537)]
--- Wipe
Default values, except for Parameter [Dark Anomaly Filter] set to [7 pixels] (this fixes the problem you had, as indicated earlier)
I also set Parameter [Temporary AutoDev] to [Yes], so I can better see the result that Wipe comes up with.
--- Auto Develop
Final global stretch, with Region of Interest over the galaxy.
Parameter [Ignore Fine Detail <] set to [2.8 pixels], in order to not optimize for noise grain.
Parameter [Outside ROI Influence] set to [8 %], in order to optimize even less for anything outside the ROI - we *really* don't care about anything else
--- Deconvolution
Let Decon generate a mask automatically.
Parameter [Radius] set to [2.1 pixels]
--- HDR
Reveal preset.
--- Wavelet Sharpen
Use same mask that Decon created.
Parameter [Small Detail Bias] set to [96 %]
--- Life
Clear mask, and invert (e.g. 'reset' the mask to everything 'on').
Isolate preset. This pushes back the busy star field a little (as well as noise), while retaining the galaxy.
--- Color
Final color calibration. We can see that alignment by DSS was not great (it often is quite bad unfortunately) with some color misalignment in some of the stars.
Parameter [Cap Green] set to [To Yellow] (to suppress any green, which is very rarely dominant in an image)
Parameter [Dark Saturation] set to [3.20] (bring color into the darker portions of the image).
--- Wavelet De-Noise
Final noise reduction (switching Tracking off)
Parameter [Read Noise Compensation] set to [26.03 %]
And that's it!
You could use the Magic module to reduce the star sizes a little and use the Heal module to fix the bad pixel column, but I'll leave that as an excercise to the reader.
(I had to crop the image a little further to fit < 200kb for posting)
Hope this helps!