Stagger animation not working when inside fixed element

[slemontwerpstudio]

I want to put a stagger component on multiple elements that are inside a position:fixed element (three buttons inside a fixed header that I want to appear one by one on page load).

The animation is working on the elements when I put them in an animation group. As soon as I add the stagger component and put the elements inside it, the animation stops working. I eventually found out this was because of the position:fixed wrapper div that contains all these elements. As soon as I set the wrapper to 'relative' the stagger starts working. Is this supposed to be working like this? Would be great if we could stagger elements within a fixed positioned div.