Keep sections expanded?

need an opinion for a better user experience. Imagine you are on some web site.  Go to page X, there are few collapsable sections.  You expanded few of them at a random order one after another.  Then visited pages A, B, C of the same web site.  Then came back to the page X with the collapsable sections. 

What is the best UX: show default (when all collapsed) or those you have already expanded are still expanded?

Thank you