why is my brown stain pink on pressure treated wood?

Hi! I am new to this site and glad I found it! I started to stain pressure treated posts on my deck with Storyboard in Brown Rabbit and while most of it looks beautiful, part of it seem to have retain a pink tinge to it. I had previously used products to clean and brighten the bare wood and to remove mildew and rinsed well afterwards. What am I doing wrong and can I fix these pinkish parts easily? Thanks for your help! ! 🙂