Bizarre stacked image

[smr]

 

I thought I'd stack together 4 nights of imaging on the Flaming Star Nebula.... all of the individual subs look ok, but here's the stacked image! Looks like a cross-stitch! Haven't seen anything like this before. 

 

[AKB]

I'm assuming that you've used an OSC (or SLR) and that the images haven't been debayered before stacking?

 

[smr]

1 hour ago, AKB said:

I'm assuming that you've used an OSC (or SLR) and that the images haven't been debayered before stacking?

 

Well, I've never seen this problem before. Because there were quite a lot of subs, around 280, DSS wanted to do another kind of debayering to the usual bilinear. AHD debayering was what it suggested so I chose this option.