Mars ice cap not showing up white

I imaged Mars during opposition and I've gotten color on the ice cap a few days before that but on my current image which has better detail, doesn't show any white where the cap would be. I use an edge 8 and asi678mc and process on pipp, autostakkertpipe, registax. Shouldn't the cap be that right hand side spot? I've compared to other images people have taken these past few days and it shows in what I think is the same region.

https://drive.google.com/file/d/10x0N6s29EPsI4JCP6ZpOo8vlwrZ9M-fv/view?usp=drivesdk