Arrows to collapse/expand sprint content aren't working consistently

I have a backlog with about 5 sprints in it. I like to collapse all of the sprints so I can see the total number of points in each sprint. I sum that up and keep track of how our points go up and down.

Anyway, I keep running into the issue of having the sprint open or in "expanded" state, but the arrow is showing as if the section is "collapsed".

I will send a screenshot.